-Not taking their shoes off before coming in
-Asking for fee negotiation
-saying things like "well, it will be tight getting here by your closing but I will try really hard"
-asking what my late pick up policy is
-being rude
-snooping around in parts of my home I did not invite them into during the tour
-allowing their kids to be unruly or disrespectful while here
-questioning the terms of the contract
-saying their child does not nap
-asking for sibling discount


That's all I can think of right now but will come back and edit and add more if I think of them.