Simpsons, The Easter Egg - Crushed Indiana Jones

In Bartman Begins, in the first room after you hit the middle switch that Bart has to glide to, a secret room will open on the opposite side on the left. Go into it and you will see one of Homer's Duff Caps, and right behind it is a skeleton hand with a brown sleeve that is crushed by a wall, and its trying to get a brown hat, referencing Indiana Jones always dropping his hat. This time, he wasn't so lucky.