Try-So-Hard: noun. An action by a young child which they work very hard on, but doesn't work out. Adults think it is amusing, but to laugh would upset the child.
Another fantastic mommy blogger, Jessica, tells me of her son, Timmy, who accidentally spilled a bowl of dry cereal. She told him to clean it up, and he was doing a fairly decent job, but when he was almost done, he again knocked the bowl over with his foot. He seemed shocked, and she had to stifle a laugh and calmly tell him to try again.