The moment the Mike lets the demon "entity" possess him. Bruddahs, we need to look more at demon theory. His slurred speech and mubling may be the demon, stuggling to use mikes body. No human can do these actions with out some help from another world.
I hope this is not showing too much for a dinner with his parents. It's not my fault! I can't control them! They get harder and harder every time people stare at them.