Care for a mint?

I was walking down the hall today with a co worker. He was telling a story about getting his car repaired, and I was politely listening. At one point, I laughed. I don't remember why, there wasn't a joke told or anything. But I laughed.
When I laughed, the tiny sliver of a red hot cinnamon mint flew out of my mouth and landed somewhere on the speckled linoleum. I wasted precious moments, looking for that mint. I don't know why I spent so much time looking for it. Maybe I just wanted to make sure that it wasn't stuck to my knee or anything. When I did finally find it, I just kicked it to the side with my shoe. (Did I have to tell you I used my shoe? Is there some other accessory I might have used to kick something?)
Our walk was halted while I looked for my mint, and as soon as I found it we were on our way again. He had stopped mid-sentence in his tale of repair, but he found his exact spot and finished off once we started walking again. Just picked up right where he left off. He never laughed. Not even a chuckle.
That just seems odd to me. I would have laughed at him. I would have giggled,
"you all right?",
"you need some help with that?",
"whoa, what's going on here?"
Something. Anything. How can you not acknowledge when some idiot lets a mint fly from her mouth? Seriously.