Its a tough one, I've had a few.
One was that I thought the obese dirty slob of a women who showed me into the apartment was the WG's helper, (nothing like the girls profile) I paid her at the entrance door of an apartment block, (as requested) then she took me up to the apartment and striped off!
Another was a girl who kept reading text while giving me a blow job, cock in her mouth and texting at the same time!!! even after I told her it was really pissing me off, I told her to leave and keep the money! She didn't go, she stayed but the moment had gone and was shit date.

Been punting for 10 years and 99% of bookings go according to plan'ish one way or another, but there's always the odd hiccup