His ex-wife was having an affair with another guy that afternoon in the bedroom. They finish up and she starts the bath while he gets dressed and leaves. She slips into the tub, but then her husband gets home. She doesn't want to share a bath with him, since she's cutting off ties now that she's getting hers from another man. He gets in.

A few days later, his friend tells him that his wife is cheating on him with another dude. It turns out to be true. Man, what a friend. But how did the friend know?

The day of the incident, his worried friend had snuck into his house to see if it were true. He was caught off guard when his friend's wife and her lover arrived only moments later. Scared, he hid in the master bathroom. But then they moved to the master bathroom. All that concealed him was a flimsy double layered shower curtain that shook with from the romping of the scandal outside. Although he went undiscovered, the predicament had taken its toll on him. And what else was there to do while sitting there waiting for them to finish but entertain himself?

"A friend (who I will always be grateful to forever)"