When we still lived at home, my brother and sister and I were always pulling pranks on each other.
I used to douse my brothers bed in water and then pull the covers over it about an hour before he went to bed.
My brother and sister used to phenagle the lock open on the bathroom door while I was 'sitting' there - and I couldn't reach it to close it, so I'd have to sit there and 'go' while the door was wide open and I could hear them laughing hysterically from the family room.
My Dad - a totally jokester, was given a birthday cake at work once and it was a water balloon with cake around it - and he went to cut it and the cake exploded on him.
Shaking up a can of soda and then tossing into a bonfire is quite 'explosive' and messy. Can really throw some for a loop - and also send bits of fire flying through the air. It was funny when it happened, but not a wise prank - someone can get hurt.