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Just anything can break:
Send us more of that trash. Bomb-proof bikes do not exist. If not just from stress, or metal fatigue after years of abuse, any bicycle part will break or bend from the nasty attack of a gnarly concrete edge. Heavy landing and crashes will only accelerate components' aging. To make the most of your bike, try to be as smooth as a cat. Or it could just be your bones that won't take it.

Samples of trashed metal.
(check out the gallery by hovering over the icons and click to zoom on a picture)

shimano BB - Julien
too much abuse

 G Force handlebars - Julien
snappy bars...

Checking the bike
Not a bad idea to check the frame and fork near the welds, and find out where that creaking noise comes from. Also check the frame around the bottom bracket frame cage.
For the bars, chromoly will bend before it cracks, whereas aluminium just snaps with no warning. So it can be wise to replace your handlebars once in a while if you do a lot of heavy landings. If you are on a tight budget, or don't ride too hard, you'll be on the typical wait-until-it-breaks replacement scheme, with the nasty crashes we are all too familiar with. But if you ride a lot and don't have a budget limit, think about changing your chain every 6 months, your bottom bracket once a year, your handlebars and forks every couple of years especially if you have an aggressive tapping technique.

Tensile freewheel - Julien
Drive problems

Giant - Alex

Basically, don't push your luck too far. Some parts like the frame, or the wheels are less unpredictable. Usually, you'll be able to detect the cracks before a complete failure, and then you know you'll have to ride smoother to make it last. After a crash, inspect your bike and check the brake levers, the rear mech if you have one, the bars, they are all the bits that tend to stop the ride.