The Mexican Hat is a song sung by Homer in "Brake My Wife, Please" when he is offered a cell phone from Lindsey Naegle that plays said song. It is a parody of Jarabe Tapatío (aka The Mexican Hat Song).
I dance, I dance, l dance;
Around the Mexican hat.
l dance, I dance, l dance;
And that's the end of that.
Or is it I guess I'll keep singing;
My cell phone appears to be ringing.