I heard this one from a Metro buddy of mine. Two officers were checking train fares when a small group of black ladies attempt to walk right by without paying the fare. The first officer, who is white stopped them and informed them they needed to pay the fare.
"You're stopping us only because we're black!"
The second officer, who is black, steps up to the women and informs them they needed to pay the fare.
"You're stopping us only because we're dykes!"
They ended up paying the fare.