Maniac
"Maniac" was the ringtone used by Kyle Broflovski in the Season Sixteen episode, "Jewpacabra".
Background
Eric Cartman calls Kyle a couple times trying to get a reaffirmation that the Jewpacabra is not real. After the second call, Kyle throws the phone across the room out of frustration. The ringtone for Cartman's number is "Maniac", a song by Michael Sembello from the 1983 film Flashdance.
Lyrics
Just a steel town girl on a Saturday night, lookin' for the fight of her life
In the real-time world no one sees her at all, they all say she's crazy
Locking rhythms to the beat of her heart, changing woman into life
She has danced into the danger zone, when a dancer becomes a dance
It can cut you like a knife, if the gift becomes the fire
On a wire between will and what will be
She's a maniac, maniac on the floor
And she's dancing like she's never danced before
She's a maniac, maniac on the floor
And she's dancing like she's never danced before
On the ice-build iron sanity is a place most never see
It's a hard warm place of mystery, touch it, but can't hold it
You work all your life for that moment in time, it could come or pass you by
It's a push of the world, but there's always a chance
If the hunger stays the night
There's a cold connective heat, struggling, stretching for defeat
Never stopping with her head against the wind
She's a maniac, maniac, I sure know
And she's dancing like she's never danced before
She's a maniac, maniac, I sure know
And she's dancing like she's never danced before
[Solo]
It can cut you like a knife, if the gift becomes the fire
On a wire between will and what will be
She's a maniac, maniac, I sure know
And she's dancing like she's never danced before
[repeats out]