As well as being able to pull weapons from crowds or pick up ones that have been thrown into the ring, you can also use your surroundings to dole out beatings. Here are the most brutal...
Use... A pillar
This is probably the most common piece of furniture you'll be able to use in the game. You can slam a guy's head into it or simply suplex them face first onto it.
Use... A vending machine
At the subway station, this drink dispenser is perfect for chucking your opponent into. Then, when he slumps against it, slam his head into the glass.
