The Evilest Holiday of All!

 is a song sung by Doofenshmirtz in Phineas and Ferb's Super Valentines Day.

Lyrics
Doofenshmirtz: After I destroy Valentines Day

With my No-More-Valentines-Inator

The Evilest Holiday will be made

And it will be so much greater

Yes the Evilest Holiday of All!

Oops, my voice cracked a little there.