In the garden store:

Him (hoisting shovel): Hey! We could add this to our arsenary.
Me: Um - arsenary?
Him: Oh, you know… er…
Me: Arsenal? Armoury?
Him: Oh. Armoury.
Me: Hee hee hee hee hee.
Him: I guess I just made an arsenary of myself.

****

(After sudden thought that one should check that ‘arsenary’ is not in fact not a Himism at all.)

Me: Okay, I’ve checked now and ‘arsenary’ isn’t in the OED.
Him: Who said it was in the OED.
Me: What then? Your mental dictionary?
Him: It’s in the appendium.
Me: Appendium?
Him: …
Me: HAHAHAHAHAHAHAHAHA