Bam's Trapdoor Bed
This is going to happen to Bam so don't tell him!!!
For this to be the ultimate prank on Bam have his parents be in on it.
Rig Bam's bed so that when he's asleep you press a button or pull a switch for the bed to open up and for Bam to fall into a (foam pit) full of snakes so the snakes don't get hurt.
If this works, Bam will freak out and his parents will have their revenge.