now, I don't work retail myself, so I don't know for sure, but I imagine that it's pretty easy to turn the change into bills if that is what they want; I mean, they need the change anyhow, right? I mean, turning one denomination of currency into another is a large part of the job. and the register is right there, right? and .75 seems like a reasonably nice tip on a $3 item, especially if they aren't taking it to your table or what have you.

so, I guess, what credentials does that other customer have? E.G. why are you taking their seemingly unusual tipping advice seriously?

I mean, personally, I almost always dump the change in the tip jar, but if I like the place and the change seems like a small tip I drop in another buck. I guess I'm cheap 'cause I don't usually tip more than that at 'to go' type places.