Maybe they just didn't want the money. Or maybe they had so much money, they were sick of it all. And they just decided to throw it in the trash so they could live a simpler and more carefree life.
Arnold
Come on, Sid. Do you really believe that?
Sid
Yes. Yes, I do.
Arnold
Look, we have to turn the money in. Besides, there might be a reward.
We'll grow old together... Oh, wait a minute, I'm already old! Well, okay, so you'll grow old alone with no one to talk to and nothing to come to, except your fun memories and...
There was this old lady on the bus, and she had pink hair, and a peg leg... and one eyebrow. And she had a bunch of shopping bags, and she must have taken my bag by mistake.