Not necessarily calm, but I think being blunt enough without shouting can still make an important impact on any person, perhaps even greater, but the commentary needs to be spot on so the message can touch the person's heart. So I personally just would've said to him, "dude, you need to stop because X and Y, and Z is going to happen to you". Getting away from him was another good choice, though, if you just don't like his way to be funny, then there's simply no way around it. There's also nothing wrong if you want to help him out, but be moderate in your approach.
My bet with The_Liquid_Laser: I think the Switch won't surpass the PS2 as the best selling system of all time. If it does, I'll play a game of a list that The_Liquid_Laser will provide, I will have to play it for 50 hours or complete it, whatever comes first.
