Not common enough for my taste. In fact, I think the only shocking thing I found last time was “poop” for radical 幺 (“short thread” in other resources)
I suggest making up your own mnemonics if you don’t like WK for some reason(including them being so silly, that it’s impossible to remember). Or just google for mnemonics. I like this one
If you hold ONE finger horizontally for too long it will start to ITCH (イチ).
It’s so short compared to WK’s novel.