I would most likely freeze and think its a dream and then i would give him a hug. Plus a किस on cheek if that would be ok. After he left i would scream my head off and call all of my फ्रेंड्स and tell them what happened
I wouldn't scream because he's not an alien,he's a human being. Would I be excited? Absolutely! I would chill with him and get his number so we can keep in touch.
I would किस him on the cheek hug him invite him to भोजन करनेवाला, डिनर if he has no plans tell him to give me his number freak out and when he leves किस him again