You might remember the lame radical with this easy mnemonic:
This radical looks like a person with a lame leg. As it turns out, this person's left leg went numb after they were bit by a snake (乚) and then had to drag their foot along the ground on their way to the hospital. Luckily, this person was okay!
Using mnemonics to remember Chinese radicals like lame has a huge impact on how long to learn Mandarin it takes.