Someone tagged @buildthis with this as an example: "a man eating peas with the idea that they will improve his virility shovels them straight into his lap." That's the whole joke shape — a substance is supposed to travel input → process → bloodstream → effect, and the subject shorts the circuit, applying it straight to the body part where the effect was supposed to land. Here's a generator for more of those.
warming up…
each one is seeded, so the link in your address bar (?s=…)
always reproduces the exact joke you're looking at — safe to share.