Scout from Team Fortress 2: What the hell is you guys' problem?!
Some guy: Shit in your hand and clap.
Scout from Team Fortress 2: But then I'll have shit in TWO hands!
A reply given to someone who wishes for something because a part of their life is unfair, basically stating that life is full of good and bad things. In essence, wishes mean nothing.
This is the earliest version of the saying, with the reference to Germans eating shit coming from American soldiers in WWII.
You know what they say Ted: Wish in one hand, shit in the other, and see which hand the German guy eats out of.