Well, lately at school I've been squealing a lot and saying "igado!" (pronounced ee-ga-doe) in a high-pitched voice every time someone pokes me or tries to(I'm very ticklish), something surprises me, or just for the heck of breaking the awkward 5 second silence. I shout it out all the time in history class, just because my friend who sits behind me loves poking me in the back with her pen. Never got in trouble, though.
I also say "I'm gonna die!" or some sort of variation of it every time I know that there's a test, quiz, or homework due that I didn't finish. Or something major that's supposed to happen. Basically, I say it every day.
Some other things I say nowadays? "OhmygoshOhmygoshOhmygoshOhmygoshOhmygoshOhmygoshOhmygoshOhmygoshOhmygosh....." "SorrySorrySorrySorrySorrySorrySorry"..... yeah, you should probably know when I use those.