Shame-u

Shame-u is a killer whale who was previously owned by Aquatraz Water Park.

History
The Simpson family watched Shame-u perform at the water park, but Lisa got too upset by it. They later visited her tank where Lisa got upset at how small it was and Shame-u's dorsal fin had collapsed. After the family were escorted out of the water park, Lisa got Bart and Groundskeeper Willie to help her get Shame-u out. They broke into the water park and set her free, where Shame-u then went head first into a cruise ship before swimming off.

Behind the Laughter
Shame-u is a reference to the killer whale.