I have a coworker. He is an open-mouthed laugher. We're talking full-on open mouth action as he laughs as loud as possible. Try doing it; it's awkward. You'd think he'd notice. Nope, he just keeps on open-mouthed laughing in the next hall and I can hear him from here. Thank God I just heard him say he's leaving. I've heard all of it I can handle for today.