Guy's Behavior

Guys, why my colleague sings or make funny sounds around me?

why my colleague sings or make funny sounds around me? sometimes he repeats funny sounds I do involuntarily? also I noticed that when I haven't eat once he asked why, then he said that it's unhealthy and he check up on me another day to make sure I had my food, why he cares? or another time when we had a conversation he asked me do I drink? and when I said NO (which was a surprise I guess) I felt he change his 'side' and says he agree and don't like or even more HATE beer. Then I notice in different conversations asking me more questions like 'what is my favourite band', 'what is my favourite song'... don't know what to think.

Guys, why my colleague sings or make funny sounds around me?
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