[mgkimsal]

Similar here. 2000/2001(?), I was talking about the bus factor with a client, indicating that I'd brought on a couple more folks on my team - one part time, one full time, to avoid the bus factor.

"what do you mean?"

"oh, in case I get hit by a bus"

Silence.

Someone in their company had been hit by a bus and died a couple weeks earlier. Not in their department - it wasn't a direct friend/colleague - but it was... awkward enough that I didn't use that phrase again for a long time. And even when I do, I tend to catch myself before and rephrase it.