Although "jumping to conclusions" is an expression, rather than an activity, it is as dangerous as jumping off a cliff, jumping in front of a moving … - Daniel Handler

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Although "jumping to conclusions" is an expression, rather than an activity, it is as dangerous as jumping off a cliff, jumping in front of a moving train, and jumping for joy. If you jump off a cliff, you have a very good chance of experiencing a painful landing unless there is something below you to cushion your fall, such as a body of water or an immense pile of tissue paper. If you jump in front of a moving train, you have a very good chance of experiencing a painful voyage unless you are wearing some sort of train-proof suit. And if you jump for joy, you have a very good chance of experiencing a painful bump on the head, unless you make sure you are standing someplace with very high ceilings, which joyous people rarely do. Clearly, the solution to anything involving jumping is either to make sure you are jumping to a safe place, or not to jump at all. - Lemony Snicket