How come my spkes on my bike are always breaking?

i have a decent bike (BMX) and i only ride it from going back and fourth form places, nufin else. But one day i hit a gutter and some lunatic nearly hit me... and a spoke was broken. I took it the local bike shop, got it fixed.. but now every 2-3 weeks of riding, 1 or 2 spokes break just from riding on flat surfaces...Example.
I was riding back from a mates house on the cycle way, i heard a snapping sound and 2 spokes were broken. This has continued for 3 months and im getting sick of it. Whats wrong??? thanks!
 
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