Being "mad," at someone is a total waste of good time and precious emotion. Besides that, your question is unclear.
You "can't tell them," ...WHY? They aren't nearby & you don't know how to reach them? They don't speak or understand the same language as you do? They have some sort of power over you...like your BOSS, who might fire you? It's a parent and you don't wish to be disrespectful?
If you have wasted enough time getting mad.....and you're SO mad you can't think straight, seems to me you have 2 choices: 1).Get it off your chest in some way ...talk to yourself, write a letter then rip it up, find a friend who will listen, or at least pretend they're listening.....OR 2.) Get over it and realize it's foolish and laugh at the whole thing.