Cackling skulls are plastic skulls that tell corny jokes when they are pressed upon. They are sold at the Summerween Superstore and require two AA Bat-eries to work. Soos has a tendency to push them to make them cackle and talk.
Later, in "Summerween," they appear as merchandise at the Summerween Superstore as the twins run past them and as Soos incessantly pushes them, as he finds the jokes they say (such as "I'd lend you a hand, but I don't seem to have any!" and "No matter the score, I'm always a-head!") to be hilarious, and thereby irritates the Summerween worker.
After Soos crashes his truck into the store while he, Dipper, Candy, Mabel, and Grenda flee from the Summerween Trickster, he blows his cover when he replaces the batteries in one of the skulls so he could get some "levity." The monster eats him as a result.
- 112. "Summerween"
"No matter the score, I'm always a-head!"
"I'd lend you a hand, but I don't seem to have any!"