Dipper attaches a crystal to a flashlight: pink light shrinks, while blue light grows.
The end-credits message, decoded with the Caesar cipher (shifting three letters back), reads: "THE INVISIBLE WIZARD IS WATCHING" . [S1E11] Little Dipper
The episode provides more development for Bud Gleeful and introduces the noticeably traumatized Mrs. Gleeful. Dipper attaches a crystal to a flashlight: pink