You might remember the meaning of the character 事 with this easy mnemonic:
A (一) new worker unfamiliar with abattoir matters covered his mouth (口) in shock when he saw hundreds of pigs hanging on the hooks (亅) by their trotters with snouts (彐) pointing down.
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.