This one would probably make a bit more sense to Indians.
So a blonde is talking to her friend, a brunette. The blonde says, "I was traveling by train last night, and I was really tired, but I didn't get a wink of sleep." The brunette asks, "Why?" The blonde replies, "I had a top bunk and I hate the top bunk!" Puzzled, the brunette asks, "Why didn't you exchange it with the person in the bottom bunk?" To which the blonde replies, "Who could I exchange it with? There was no one there!"