A group of butchers are standing around talking. Joe complains how hard it is to keep staff nowadays, “I had to sack the young guy I had working for me. He kept sticking his dick in the meat slicer.”
“Why would he do that?” asked another.
“Don’t know,” said Joe,“but I had to sack her too.”
While on a long car journey, a penguin’s car breaks down. He leaves it at the garage to be fixed and waits in the ice cream shop next door. A few hours later, he wanders over to the garage.
The mechanic says, “Looks like you blew a seal.”
“Oh, no” the penguin replies. “Milkshake.”
(If you don’t get this, imagine the pengin wiping off his beak)
Let’s assume your real name was Danny, "Human (Wordman) walks into a bar, bartender says, “Hey we do a drink named after you!”, Wordman says, “What, a ‘Danny’?”
What you missed was that while the joke describes the insect, and that’s how the bartender recognizes it, the insect has a name. A name is a label for a human or animal, thing, place, product (as in a brand name) and even an idea or concept, normally used to distinguish one from another. Names can identify a class or category of things, or a single thing, either uniquely, or within a given context. A personal name identifies a specific unique and identifiable individual person. So while we call grasshoppers “grasshopper”, this anthropomorphic grasshopper has been given the name “Trevor”, thereby the punchline in an unexpected response.
I’ll hazard a WAG that there is a cocktail called a “Grasshopper”, but the grasshopper thinks of himself by his own name, Trevor, and not the name of his genus.
Ah - there you go. I actually have heard that genre of joke, but Trevor is an uncommon-enough name in the U.S., that I thought it might be a specific reference…