you are a creep

Today this guy comes into our office saying he has a meeting with one of the people in our legal department, after a few minute it becomes clear that he does not have a meeting but is trying to drop something off for them. While he is waiting for someone to come out his dude proceeds to do a number of creepy things. First he starts kinda singing/humming to himself. Then he opens a magazine and begins reading the articles half allowed, he also at one point was pacing around the reception area. Finally someone comes out to talk to him. Since he was basically just dropping stuff off they begin going through it on the counter in front of me. Sooo I realize right away when he begins drinking a half empty bottled water that someone in the office had left there. I almost wanted to say 'sir, do you realize you are drinking someone else's water', but I held back. He asks the woman if she can make a few copies of something, so while she is gone he starts asking me all this stuff. If I like working in this area, blah blah blah. Then he asks if I like NYC and how it compares to LA (which is weird to randomly ask because he had no idea if I've ever been there). I tell him that, yes I like NY and then talk about it a little. He goes, yeah I've never been there so it's interesting to hear about. Then he says something about the weather being better here and if only we could have a NY on the west coast, because (and I quote) he lived in NY for a few years and it was great. Excuse me, did you not say just 30 seconds before that you have never been to NY??? And you are STILL drinking that water. He asks a few more weird things like which venues I like, I'm then saved by the woman coming back with the copies he wanted. She leaves, he gathers his things nervously (and creepily) and then looks around like he forgot to do something. Now he has been here way too long and it's making me uncomfortable. I kept shooting him looks like 'why are you still here'. Finally he leaves and takes the water bottle with him. Weird.