Use it to fix old instruments. Use it as a dog/cat/rabbit/frog/lizard/etc. leash. Hold on toupees. Duct tape annoying, rambunctious students to their seats. Reupholster the roof on a '83 Mustang convertible (or any vehicle for that matter). Attach it to the end of a yard stick (sticky side out) as a way to get pennies out from behind the couch. Surgical bandage. Fix a cigarette that is broken at the filter. A clothesline when you're out in the middle of nowhere. (Peace Corps favorite.) Use it as a substitute for Bondo.