The Foreigners' Dilemma
A bus and a taxi are coming towards you. Your intention is to take the bus. If you stick your hand out to flag the bus down, you know the taxi driver is going to misinterpret your gesture as an attempt to flag him down. The taxi then cuts the bus off in an effort to stop close enough to you. Honks are exchanged before the taxi driver realizes his mistake and continues on. If you don't stick your hand out to avoid the aforementioned scene, the bus doesn't stop and you're left standing in the rain.