This is WAY off the subject, but this thread reminds me of several years ago when I help my dad (a biologist) chop through the ice and frost layer here in NH to dig up earthworms to find out how deep they went in the winter and he studied their state of "hibernation" (not quite the correct term for their state, but you get the idea) Anyway, they go down about 12" and curl up, much like your pulltab... maybe they're related. :P