The Opposite of Eavesdropping

Is there a word for a situation in which you are forced to listen in on someone else’s inane conversation? If there isn’t a word for it, there should be.

Here’s part of the conversation I had to endure while in the coffee line this morning:

Trader #1: Dude, are you around this weekend?

Trader #2: No, man, I have to go to my little cousin’s 21st birthday party.

Trader #1: Too bad.

Trader #2: Yeah, but my cousin’s like, smokin’ hot, so it should be cool.