That reminds me of something similar I did.
In HS my best friend and i somehow came into possession of 10 gallons of soap concentrate and about 20# of concentrate powder. Wondered what it would do if it was dumped in the HS AC outside evaporator unit. Very disappointed the next am when nothing was amiss.
Then in 2nd period, Everyone was "Have you seen the teachers parking lot!?!?!?"
It turns out that the AC didn't kick on until classes started and when it did, it covered about a quarter of an acre with thick soap bubbles, including most of the teachers' cars. afaik, no one ever found out whodunit.
(no one ever suspected me of a lot of stuff because I was "the good kid" which actually meant I was smart enough to never talk or get caught)
AMEN to that one. In HS I had a BEST buddy. He was just like me and we for the same reason as you were never caught. We went so far as to understand that if we got pulled into separate rooms They would tell each of us that the other was already talking. We Kept our mouths shut. We told no-one of our pranks and just sat back and relished the day in silent enjoyment.
Rival school graffiti'd our pet rock, we slipped in and cut down their Pet Oak tree
Seniors told us to Bob on them, we stole Bob's Big Boy and displayed him at their Senior snack bar.
We also Soaped fountains (Joy Dishwashing liquid, best wall of bubbles ever) and I love the Red Dye idea, Brilliant
But the one that almost got us, and if we were caught would have been very bad for us, was messing with the school principle. He was a starched white shirt and tie guy and to say well he had a stick up his...think Popsicle. Think of the most annoying movie principle and he was worse, and to give him credit today, he saw right through us. He always had his eye on us and we decided it was time for his turn in the barrel.
We played with tons of electronics and had a copy of the Anarchy Cookbook (wish I still had it) and it was game on mayhem. My buddy Greg's Dad worked for the phone company and he would bring home 48 volt batteries that when ran in series and shorted got VERY hot. This combined with a servo from a remote control car and some tape and Houston we had a plan.
The principals office was on the main quad and was all glass window, his desk faced the door so we always had a plain view of his back when he was seated at his desk. We did a Ninja black out and glove excursion after hours into the school and Jimmied our way into the faculty building and into principal starches office. We taped this contraption that we made to the lead seal on the fire sprinkler above his desk. We locked up on the way out. The next day it was all excitement and hoping he didn't notice the sprinkler sandwiched in batteries and waiting for the timing for him to be at his desk while we were in the quad. We needed it to be crowded or we would be busted as the cheapie Remote control only had a short RF range. Third period it was on, we rushed out to the quad and he was sitting at his desk. It was now just a matter of walking to the planter where we had the device stashed and press and lock it into forward. We then casually walked away gaining as much distance as possible. Man we didn't know if it would even work... but, It did. Within a minute or two the sprinkler let go in his office. From what I recall the alarm bells were almost as instantaneous as the Principal shooting from his office out to the Quad to catch a culprit. He was FUMING mad and as a bonus, you would think that (like the movies) that the water is all clear like it is being sprayed from a Sparkletts bottle but it is not. It is BLACK like the iron pipes it lives in and Smells fairly wretched like sulfer and sewer. He came out wet and Black. We did not realize before hand that a stunt like this would cause sooo much attention but our CYA packed was tested to the fullest.
A) We did not count on the fire alarm Not sure why but just didn't realize that flowing water would make the alarm sound and it brought every fire truck in our city to the school which also brought the cops, and the investigators.
B) We did not realize that no one would know how to shut off the main valve to stop the water flow and we flooded most of the faculty building.
They found our remote.and checked it for prints! They grilled everyone including us. What was our knowledge of batteries, did we own a remote control car, did we know of anyone playing with these cars or did we know of anyone making things out of the parts of these cars etc...etc...
We kept absolutely MUM and it was the only way that we escaped some serious doo doo. i hope you enjoyed the story. press like if you want to hear the story of how Greg and I blew up every hole of the back 9 of our local community
Cheers all. Love this thread.
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I think he got his butt chewed too. 
