I've not seen too many celebrities in my life. It sort of depends on the situation. I would respect their privacy if they were out and about like normal. I would think it was pretty cool. But if they are playing to the crowd, I would get excited. I would smile. I watch Carpool Karaoke. It's from The Late Late Show. The host and a celebrity ride around and sing. Sometimes they open the window and say crazy stuff to people. If I saw that, I would smile and say Hi! If it was Justin Bieber, I would scream. Lol!