How about speaking to the *wrong* crowd? A minister in the BJP government of the state of Karnataka in India, VS Acharaya, did exactly that.
Seeing an election rally under way while visiting the district of Udupi, he decided to go and put in his two cents worth as a courtesy to the locals. After delivering a blistering attack on the incompetence and corruption of the federal Congress Party led government, he discovered that he was speaking to a rally of, you guessed it, the Congress Party!
Police said the senior BJP leader beat a speedy retreat when he realised his mistake.
It's only a matter of time before that happens to some local hapless dolt.