Zoolander (Ben Stiller) male model leaves to get in touch with his roots (brother, Vince Vaughn, dad, Jon Voight) coal miners from W. Virginia. Zoolander puts in one day at the mine and complains of black lung at the bar after the workday.
A commercial with him dressed as a mermaid, selling male body moisturizer comes on the TV in the bar causing Voight to tell him "What the hell is that? walking around in your underwear with your wiener hangin out, dressed like a mermaid? Your dead to me son."
Zoolander cries "Merman dad! Merman!" and runs out the door.
I had a hard time sitting through the whole thing but that was a very funny scene. :-)