If you haven’t watched Casper in a while, Halloween is a pretty good excuse to revisit the 1995 movie. And when you get to the part where Clint Eastwood suddenly appears, you might wonder if you’re remembering the movie correctly.

The family-friendly ghost comedy really does feature Eastwood, Mel Gibson, Rodney Dangerfield, and the Crypt Keeper in one of the strangest celebrity cameo sequences of the ’90s. And there’s an even better story behind how it happened.

The scene comes when the Ghostly Trio — Stretch, Stinkie, and Fatso — are terrorizing Bill Pullman’s Dr. James Harvey.

At one point, they take over Harvey’s body and his face begins transforming in a mirror. First, he’s suddenly got the unmistakable face of Clint Eastwood. Then he turns into Rodney Dangerfield.…