And yo they took me to the bathroom, started up the chainsaw yo
You gon' talk or see your brains on the floor

from Ghostface Killah (Ft. The Notorious B.I.G. & Raekwon) – Three Bricks Lyrics on Rap Genius

Meaning

Anyone who has seen Scarface will get this reference. If not, the exact same thing happens in the film and similarly. The goons use their chainsaw as a weapon to threaten Lex, which is a pretty intimidating piece of machinery.

http://www.youtube.com/watch?v=kg7goEASO5E

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