On the subject of tipping

I just had the most awkward interaction with a client, we had just completed payment by apple pay.

Client:"Do people generally tip you?"

M:"yes, if they feel the service provided was good and want to." Hands me a couple folded bills

Client:"is that enough? I've never had to call a locksmith before."

I haven't even looked at it, I just palm it into my pocket out of habit.

M:"it is by no means required but always appreciated, and anything more than covers it."

Client:"are you sure it's enough?"

M:"it's more then zero dollars and yes it's great, thank you!"

Dude we just secured your family's house with new locks because your mom is now in inpatient hospice, I'm not kicking you in the shins for anything. But truly anytime someone wants to tip me is great, this interaction was just super awkward.

Then there's the flip side; I remember my current coworker (journeyman) who only really does commercial work pulling me quietly aside and asking, "do residential customers usually tip you?" "Yeah it happens" "I didn't know what to do, I've never had anyone tip me before."

Anyone else have any good tipping stories? (Besides the can we give you a beer for the road, do you want some other illicit substances?)