Lol... The 'leather wedge' - I just call it a foot wedge.
With the right group of guys, pranks on a golf course can be hilarious! If you get a debbie-downer type, it turns into a looong day.
For a while, I played with a guy who always had to be angry at something. Pace of play, speed of the greens, people in front of us, poor weather, whatever - he just had to be angry. I didn't necessarily mind it until one day he decided to be angry at me. He decided to get angry about my handicap and that it wasn't fair I got strokes. He was mad that I 'didn't know the rules' and berated me constantly throughout the round. Mind you - it was a friendly game with nothing on the line - no betting etc. He began ripping me for being an uneducated public golfer. That round ended our friendship.
No need for anger like that on a golf course!
We had some guys who had fun, unstrapping the golf bag from the cart, or swapping peoples clubs around. Mostly harmless fun and was a good time. Lots of needling on the course - trying to mess with each other's heads. Always some smack talk.
I heard about a pretty good prank - putting suntan lotion on peoples grips. Actually, that's a pretty mean one - you can't play when that happens! Most times you can't clean them well enough, you've gotta replace the grips. A buddy was playing college golf and someone on the team did that. It was hilarious hearing the story, but man, I would never do that to someone else!