Make Jell-O according to package instructions and pour into mold. Refrigerate until set.
Once the Jell-O has set, dip outside of mold into a bowl of hot water to help loosen the brain. After the brain has loosened around the sides (approximately 30 seconds), place the plate on top of the mold and invert to remove the brain. If it doesn’t come out, repeat the hot water dip and invert again.
Insert gummy worms into the brain or arrange around it on the plate.
To play with leftovers, pour the brain contents into a bin. Have towels ready because this is a sticky one!!