She's only wearing one sock.
Don't worry, they'll tell you.
Black people. (Slightly Racist I know)
They don't like to look down on the unemployed
Chapped lips
When you drop a load in, it doesn't follow you around for 6 months trying to get spun. 8)
If she's only wearing one sock. (This joke brought to you courtesy the homeless guy outside my local 7-11.) Edit: tweaked the punchline.
In case they get a hole in one!