A lot of the time I think it's the anxiety causing them to not think straight, does funny things to the brain.
Had a guy turn up at my hotel, gave him direction to the room, he text me what's the number again, so I called him back to explain again. On his way, then room phone rings & it's the front desk telling my I've got a visitor.
Needless to say I was very annoyed. Was tempted to tell him to do one for bringing attention towards me but he seemed nice & I was quite blunt about him going to the reception. Anyway without being too jackanory, he turned out to be a nutter in the end after 5 appointments or so.
Always go with the gut, if they seem like a pain in the neck they most likely will be.