Me, two nights before the exam:
“I’ll make a genius mnemonic. I’ll never forget this.”
Mnemonic: “Silly Apes In My Car Like To Party Hard”
Meaning: Unknown. Decoded by nobody. Not even you.
Me in the exam:
“Okay… Silly Apes… why are they partying??
What does this even mean??” 
Brain:
404: Mnemonic Not Found.
Try again in next attempt.