Be what I call 'unintentionally' rough, pushing you and pulling you around like you are a doll. Hmm maybe not so unintentional...
I saw one client like that just now and had to tell him a couple of times no rough stuff, (
and DO NOT hold my head down during oral)
Then he came really quickly and had the cheek to ask could he
change it to 30 minutes ie. get a refund, NO I SAID I CAN'T DO THAT

At least he accepted it, showered and left, but really it's not my problem, if you book an hour you pay for an hour, no matter how quickly you come...
Edit: Just noticed he used up nearly a WHOLE bottle of shower gel, great now I've nearly run out.