Well, I'm not sure if this is what you are looking for or not...
If you were to take a piece of string and attach it to a washer, then take the washer and glue it to the balloon before you threw it, once the string becomes taut (tied to your wrist or something similar) the ballon should burst. With a small enough washer, you shouldn't really have to worry about anyone getting injured.
Good luck - let us know if you find a workable solution!
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