Yesterday I mentioned the fact that I was playing for two school musicals - one by remote control, as it were. The second one is a musical I've played years ago, though when I first started to go through it again it, it didn't seem familiar at all. However, from the second number in, it all came back.
I was talking with my son this morning, and mentioning the musical in which he played the trumpet as a child. Instantly he began to sing a song from it - 'You never forget those ones!'