World's Worst Pun

Is this the world’s worst pun? Tell me what you think.

A famous scientist had an aging, toothless lion as a pet that used to lie across the outside doorstep to his lab sunning itself. The scientist was working on a formula to keep dolphins alive forever. He discovered that sea gulls fed to the dolphins could be the answer. One day as he was stepping over the lion to enter his lab with some seagulls, the FBI arrested him. What was the charge?
Transporting gulls across a staid lion for immortal porpoises.