Yes I would, and, indeed have. Left a parlour (one of those where you pay a door fee and a 'tip' to the girl. I was a regular and she just dived in once we were alone. Realised later when I put fuel in car and saw the money still there.
Went back, saw her in between punters. Gave her the money, she said she hadn't realised either, had a great service next time!