I work with this woman who I'm not too crazy about, and the more she goes on and on at meetings, the more crazy I start going. In about three consecutive meetings she has said "strag-e-dies" instead of strategies. I was screaming inside my head, mad as hell that someone could get over 40-years-old in a professional setting still saying a word that horribly incorrect. Then "Tragedy" by Bee Gees popped in my head for reasons I at first didn't know, but then I laughed having realized that I was singing "Stragedy!"
Songs pop in my head all the time and crack me up. There are people I see every day who have no idea that they have their very own theme song playing in my head when they walk in the room. And it's a good trick that I recommend to keep you from getting too serious and angry at work. Just assign that awful person a funny song and get through that meeting, humming and laughing to yourself like a crazy person.