My friend said, "Dude, if you don't put your desk in line with the column, you're gay." So he did it, and I said, "Well, I guess now he's straight." ;D
Desk Alignment Dilemma: A Punny Predicament About Orientation and Alignment
Explanation
Explain Bear
Listen up, nimrod. You see, the joke here plays on the double meaning of "straight." At first, it refers to aligning the desk in a straight line. But then, it's used to imply the friend's sexual orientation has changed to heterosexual after aligning the desk. Get it now, genius?