Rap song stuck in my head and I don't know what it is...?

I was driving today listening to a CD that wasn't mine and there was a
bunch of great songs that I had never heard. The CD wasn't labeled and
I don't know whose CD it is. The one lyric from a song I remember
is... "Diabolical Scientist...it's contagious!". It's a rap song that
is only those words and a really nice beat. I just can't figure out
who sings it. Help!