I convinced Bob to get over his fear, and jump from the high board while there was no water in the pool.
Are you being serious? That could cause serious injury, why would you tell him to do that?
Do you have a better idea?
It's extremely disturbing to convince some of the jump off the diving board in a pool of no water. If you try to pull a prank on your friend you should find alternatives that would not involve harming them. If you go through with having him go off the diving board he will most likely be severely injured and have to go to the hospital.
I intent to go through with it, besides I've been an accomplice in this.
I think you knew this was dangerous so it would have been better to warn your friend and show him you care.