The way you guys come out at the end of the prank is a real buzzkill. You just walk out and tell the victim. That's boring. Any other idea would be better. Even if Johnny walked out and got involved in the prank would work. If the victim knows him, he will know it's a prank. If they don't know him you could just keep adding people until the person they know shows up. We need a climax. We need a great look at the realization the victim has when he understands that he has been pranked. Just the fact that the victim has to be told that it's a prank really takes away from the fun. Let them realize it themselves.
Review of The Prank Panel
