A reader writes:
The three guys who run the loading dock at my work are, variously, Cambodian, Dominican and Tibetan. Imagine my shock, as a lilly-white, sheltered, PC North-eastern liberal, when I found them one day laughing uncontrollably at a very un-PC YouTube clip of Canadian comic Russell Peters ripping on people's accents. It didn't take long before they were ripping each other's accents and eventually ripping my (possibly heavy) Boston accent. Everyone had a laugh and a good part of my liberal guilt died that day.
I recommend this in the same vein:
Try not to laugh.