Kunal Nayyar recently opened up about Johnny Galecki's unhygienic habit on the set of The Big Bang Theory. Nayyar shared that Galecki would do this disgusting habit during their scenes when the gang is walking up and down the stairs. Kunal said about the habit, "You run back up the stairs that go nowhere, and then you walk back down as if it's a new floor. Down there is nothing." He continued, "There's a wall there where Johnny Galecki, for 12 years, would stick his chewing gum on. I'm not joking. So, if any of you are Johnny Galecki fans and you want his dried chewing gum, I am sure it's for sale somewhere on the internet. Welcome to Hollywood." What weird habit do you have? What type of quirk do you have?