It was the beginning of the day, we were about to go into a meeting, and I had no idea what he was talking about, and was momentarily concerned that I had overlooked some work-related thing that I was supposed to have filled out.
My confusion must have been very apparent on my face, as he then said, "March Madness? ...Basketball? ...College basketball? ...The championship? ...Are you filling out a bracket for the office pool?"
Oh!! Much relieved, I said that I had not, and did not plan on filling one out, due to my (very obvious) total lack of knowledge and interest when it comes to sports.
I was better able to seem less ignorant in Europe, where the only sport that anyone ever talks about is soccer. In the States, however, there is always something going on -- football, basketball, baseball, hockey -- and they overlap, so a non-sports person can never be sure what kind of game people are referring to watching "the game," and someone who is completely uninformed about sports (like me) is clueless about what kind of playoffs are going on at any given time.
At least it wasn't some work-related thing that I had forgotten to do.