Rewind·Posted on Feb 12, 201316 Fascinating Facts About Jell-OIt's International Jell-O Week, people. These unexpected tidbits will change how you feel about one of America's oldest desserts.by Leonora EpsteinBuzzFeed StaffLinkFacebookPinterestTwitterMail 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. View this video on YouTube Bill Cosby has been a Jell-O spokesperson since 1974 — that's 39 years! 12. 13. 14. 15. 16.