I had never got a flat before today. I took my old beat up bike and bunnyhopped a curb and nailed the curb with my rear tire, just lightly, and i got an immediate flat. i figured it was an isolated incident so i got on my nice rocky mountain MTB and rode to the gym. when i got there i bunnyhopped a curb just like the one at home, hit the curb in the same way, and immediattely flatted the tire. i can't imagine it was from the impact cause i nail curbs all the time when riding up them. does anyone know what happened or how i can prevent this in the future (besides bunnyhopping higher)?