The Forget-Me-What Flower is a flower that Brainy found in the 2021 cartoon show episode "Forget Me What?" when he, Clumsy, and Dimwitty were in the forest to collect it. The flower causes whoever sniffs it to fall into a state of complete obliviousness, with no memory of who anyone is or what anything is.
In the story, Brainy, Clumsy, and Dimwitty were in the forest as Brainy was lecturing the latter two about it. They had to destroy it under the request of Papa Smurf, but Gargamel finds them and they run with it using nose picks and tweezers. Brainy then stops and shoves it up Gargamel's nose, causing him to lose his memory and turn over a new leaf. Gargamel turns back to normal in the end as Azrael triggers his memory back.