The people behind me at the airport didn't realize I understood French
People really assume nobody around them understands French.
I was at the airport waiting for my flight while two people behind me complained nonstop about the boarding line.
At some point they noticed my oversized backpack and decided I was personally responsible for delaying air travel.
Then they joked that I couldnt understand French.
I waited a minute and replied in French, You are right, I understood absolutely nothing.
Instant silence.
Then the guy laughed and admitted it was a good comeback.
The best part is they spent several minutes treating the airport like they were having a private conversation.