This is close to a CIDU, as there doesn’t seem to be a single best / obvious answer to the question.
Tim Harrod sends this in: “Whether you laugh or not, Jim Davis is historically reliable at coming up with a punchline. But here, the joke is apparently that the eggs are really spicy… and a lot of people ordered them. It could have been a scheme to sell a lot of milk, but then Irma should have more of a sly grin in the last panel.”
The gag seems straightforward, but Tim’s right: she should have a sly, knowing grin on her face.
CIDU note: So what was their plan? Or is it merely a non-coordination mixup. The usual TV story would be that they planned to go to town and do something wild.
He meant to order an inflatable doll, but received an inflatable bed of nails.
P.S. A couple days later, this character and that prop re-appear; but decidedly not funny :-( .
BTW, Gocomics gives this feature filenames that look like loesp230927.jpg, clueing us that at some point they were considering it to be Life On Earth in Spanish. (The same artist does the Life on Earth comic.)