If you're still young, and you're laughing at this, just make a mental note of the expression. Some day you might need it—to describe your own mental failings. I know, it'll never happen to you, right? (I think I hear my sons snickering in the background somewhere.)
I was playing guitar today and couldn't even remember the words to a song I wrote. I only wrote one song, so how hard could it be? Now, that's embarrassing. Um, I think it went like ... well, I guess I forgot the words. They were pretty funny, too, if I remember right. So after a wonderful visit with Chris today, I ended my evening by emailing her an mp3 of me singing the song I couldn't quite remember when we were together today. I guess I need to relearn it.
LBS. It's hard to get rid of it once you've contracted it. Stuff just leaks out.