"A really stupid frog joke" joke

A teacher had a 5-year-old come up to her and said that he found a frog. The teacher asked, "Is the frog alive or dead?"

The student replied, "It's dead."

The teacher then asked, "How do you know for sure?"

The boy said, "I pissed in its ear."

Aghast, the teacher said, "You did what?"

He said, "You know, I went to his ear and said,' PSST!' and it didn't move. So, it must be dead."