A Joke. HA HA HA

Let me tell you a joke. A frog went to the doctor and said his throat hurts a lot. The doctor made a check, and told him that to be careful not to let anything touch it, it's a dangerous tumor. You might die if you touch it. And the doctor asked him that did he understand. The frog said yes and nodded and he died.(If you don't understand, just nod. And you'll understand why did the frog died.)