
Flubber
Numerous reports came out the kids were experiencing sore throats and strange rashes after playing with this goop. Hasbro did a recall but made no mention of the medical concerns. What happened to the recalled Flubber is also a mystery. Some failed attempts claim they tried to light it on fire (Flubber is not flammable) and tried to dump it in a large body of water (Flubber doesn’t sink).
(#5 And jarts were a lot of fun to throw at one another, except for that whole skull piercing thing)