Drake feat. Drake ~ when rappers go back-and-forth with a pitch-altered version of themselves

I've always found this to be an interesting concept for a hip hop song, and the results can be quite entertaining when done right, as evidenced below:

Slick Rick - Mona Lisa (see also: Trouble On The Westside Hwy, and many more)

Redman - Redman Meets Reggie Noble

The Notorious B.I.G. - Gimme The Loot

DMX - Damien (see also: Pt. 2 & Pt. 3)

Canibus - Bis vs. Rip

J-Zone - Inauguration Day

Jay-Z - 99 Problems

Louis Logic - Revenge!!!

Eminem - My Darling

Edit:

eLZhi - Hands Up

Murs - Trevor An' Them

Kendrick Lamar - Swimming Pools (Drank)