Hello,
I was reading the Reading Explanation for 下 and… I don’t get it.
“What’s below you? What’s below your foot? Oh no. The worst thing possible: It’s した.”
Maybe it’s because I’m French. I’m not a fluent English speaker.
Most of the time, it is ok. But for this one, I’m “lost in translation”.
What does した means?
Is it a reference? Or a pun?
Tahnk you in advance.
It means sh*t
Or as our French friends say: mèrde
It’s a pun - I’ve found alot of these don’t work with a “french” brain. Try coming up with your own it’ll help immensely 
Aaaaah… ok.
I see. 
My mind was too prudish.
Turn slang mode ON
Thank you dirty comrades.
Honestly, that’s pretty much the key to every mnemonic used here - they’re meant to be an aid to your learning, so if they’re not actually aiding your learning, just come up with something that does.
yeah and add it you your note section as a further memory aid 
My mnemonic is cheetah (can be pronounced like shita in french) is hanging below the branch.