Captain Spaulding: One morning I shot an elephant in my pajamas. How he got in my pajamas, I don't know. Then we tried to remove the tusks. […] But they were embedded so firmly we couldn't budge them. Of course, in Alabama the Tuscaloosa, but that's entirely irrelephant to what I was talking about.
Source: wiktionary
It was no fluke that the best of elephant-joke books — 101 Elephant Jokes — was written by Robert Blake, fourteen, who ran the following warning at the beginning of his work: "Practically no parents will think elephant jokes are funny."
But all of this is quite irrelephant; bring on the jokes.
Source: wiktionary
Anything that is unrelated to elephants is irrelephant.
Source: wiktionary