I just found out that the "Grandpa Munster" character in Gremlins 2 was not played by Al Lewis. I feel like my life is a lie

I just found out that the "Grandpa Munster" character in Gremlins 2 was not played by Al Lewis. I feel like my life is a lie
I know how you feel because when I watched Thief I was certain the entire movie that the villain (Robert Prosky) was the Grandpa Munster guy and was shocked when I found out it wasn't him
I'm not sure if you know this but Prosky is the actor who played the character in Gremlins 2 that I was talking about