Your forehead is so big that it could carry the passengers of the Titanic.
Your forehead is so big that you can see the whole world before you do!
Your forehead is so big they call you the Leaning Tower of Forehead!
Your forehead is so big Mega Mind gets jealous.
A zebra couldn't find any grass. Then he saw a monkey cooking. He thought to steal a little, but he was burned in the fore, and the smoke was all over him. But when he went to the ocean, it was still there, and zebras are stuck in this style forever.
Ok, here's a story about the church.
There were two parents, then they had a baby. Then they go to the church and the baby was getting a cross on his forehead. Guess he was big headed. Sorry if this offends anyone or makes this joke bad since I keep writing this.
What's 2+2? FORE-head.