Ever set off fireworks in a shopping mall?
I did that when I was like 16 yo. The way to do it is use a cigarette for a timed delay (approx. 5 minutes). We used those whistling "Saturn Missile Battery" that shoots about 25 small whistling missiles that zig zag every which way. God it was funny. Security was pissed. Back in the day before they had CCTV up every human being's arse to see what you had for dinner the night before.
Yup. It was a hoot.