I'm sure I've had worse than this one, but this always sticks out in my mind.
I was about 12 years old or so, watching television with a few of my relatives at Thanksgiving when a commercial for "Buddy's Carpet Barn" came on and I opened my big mouth.
"Who in the heck would name their kid Buddy? What a stupid name."
My cousin replied, "Well, my name's Buddy."
"Yes it is," I said, recalling a moment too late that a man named Buddy was two feet away.
You know, in thinking back on that, I've met only one person in my life named Buddy, and I've only uttered that sentence one time in my 37 years and he just happened to be sitting right next to me when I did it.