Occasionally, and very rarely, of course, I catch myself saying totally stupid things to ATC. Like earlier today when I was practicing touch and goes at KDPA after the tower cleared me for the option on runway 20L, while several other aircraft were been sequenced in and out of 20R. Flying Ace: DuPage Tower, Diamond 866US, would like to remain in the pattern. Tower: ... roger. Flying Ace: Left traffic for 866US? Tower: ... um ... affirmative. ... Flying Ace, 4 minutes later, to himself: d'oh! So, what're some of your ATC blunders that you'd like to share?