I went of a camping trip with several friends years ago.
We all had a good time hiking about the hills and then settled down at the camp site for some serious drinking and eating.
My best friend was there with his future wife. Both of them--as well as everybody else--got quite drunk. After everyone else had gone to bed I went over to wear my friend had left his jeans after he crawled into his tent with his girl. I stood up, rather unsteadily as I recall, and unloaded my bladder on the crotch of his jeans. Then I went to my own tent.
The next morning his girl discovered the wet jeans--which smelled pretty strong by then-- and was furious with him. Everyone else in camp found out about it from her bitching at him and it was pretty humiliating for him.
I wouldn't have done it if I hadn't been drunk but it seemed funny at the time.