We don't have cannons. What you heard were the Ruffnecks shooting off their rifles.
CharlesWayneCT was quoting *me* on the "cannons" thing. I didn't mean big old wagon-sized cannons like TAMU's, I meant those hand-held boomer things they shoot.
They weren't rifles the last time I saw them, unless maybe they're some kind of air rifle rigged to sound extra-loud or something (I know nothing about rifles, just pistols). They are the Ruf-Nek white cylindrical columns about 3-4' long with red writing on them. I'll look for a pic.