I had a creepy experience at the grocery today. So I was picking some drinks and there was a guy came near me. When I took a bottle of milk I heard he said "what flavor do you want, oh that one, okay". I thought he was talking to someone else so I looked at him to make sure but turned out he was alone. Then I took another bottle and he said "ahh what should I take now", so I looked at him again and our eyes met. Then he said "looking at me like I'm insane, oh never mind people can think whatever they want". And I left him immediately but I still could hear him talking to himself again.

There are four possibilities here.
1. He has mental illness
2. He might try to flirt with me
3. He tried to distract me to steal my wallet or
4. He wasn't real and I was hallucinating