If there are three lanes going straight in a street, don't make a fourth one with the Turn Right Only lane.  If you do, you're going to:

1. Look incredibly idiotic, especially if your license plate matches the state you're in
2. Be a douchebag, since you didn't signal
3. Piss off the driver that you're cutting off
4. (Optional) Be yelled/cursed/glared at by the driver from #3