This one is actually from last week, but I forgot about it until the kid reminded me last night: I was teaching the kid intervals, with song examples for each one. For the major sixth, my example is the first two notes of the famous "NBC" three-note jingle.
ME (after playing the three notes): You've heard that on TV, right?
KID: Yeah! That's...Fox.
KID: No, wait, I meant NBC.
ME: That would be funny if Fox tried it. (sings) F-O-X!