How have you avoided a potentially embarrassing moment?

There have been some particularly tasty bean products available lately, including Aldi Creole Red Beans and Beanitos at Big Lots. Consequently I’ve had some pretty deadly gas.

I took my car into the shop today and they replaced the alternator. When the mechanic got done, he pulled the car around, left it running, and walked around it.
When we came in, we asked him what he was doing.
“Smelling the exhaust.”
Huh?
“When I got in the car, I thought it smelled a bit like sulfur, and that can be a sign of a clogged catalytic converter. I smelled the exhaust, though, and it seemed okay.”

I didn’t even blush, but paid, thanked them, and left.
With the window down.

Care to share?