Our warped friends at Cracked.com have a great article titled "6 Movies that Are Inexplicably Getting Sequels Decades Later".
Here's a taste:
"We thought the world had moved on, but earlier this year, the aged bulk of Black Forest ham that is Arnold Schwarzenegger revealed that he, Danny DeVito, and Eddie Murphy have signed on to appear in a sequel titled Triplets (original working title: These Three Motherf*ckers Can't Possibly Be Related). Because evidently the same joke has only gotten funnier since 1988."
Go to Cracked.com to read the full article