That thing was a blast, but rated one notch below yard darts for danger...
I took that thing in the eye well more than one time...
You would pump it up until you couldn't pump it any more, then hold it between your legs because the release was to hard to do with one hand...
Rocket between knees, head bent over watching, suddenly snap the release, experience temporary blindness for a while and subsequent black eye...
But it was all worth it...

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I knew a kid that put a .22shell in a hole of his cushman scooter and shot it on the cap with his red Ryder BB gun , thought it would launch the lead,but the hull came back and creased his cheek,how did we live through the good ole days? That is where the "You will shoot your eye out",came from.