NBC edited the tape down a bit, but when we recorded the segment, I stumbled for 10 seconds to remember the last two lines of the Eyes of Texas. Which is fine - I learned long ago not to be afraid to look like an idiot - but this is a particularly mystifying gaffe. I did the math and calculated I must have belted out that tune at least 250 times in my life.
Apparently, though, not under pressure. The lesson, as always: don't be afraid to laugh at yourself.