But he did have cash after the delivery. He didn't even own his personal wallet? He screwed himself out of $5 by not making change.

He and the joynt are perfectly withing their rights to say exact change required and then it is your problem to pay the bill with what you have, but that still leaves him in the lurch for the tip if it comes down to it.

There is always small bills around here somewhere so it is never an issue.