When “金” fills a head
Why it is in the set
This one needed care. Money is the easiest subject in the world to be cruel about, and the site has a rule against any line that touches wealth or poverty. 金 is in the set because a head can be full of money without that meaning anything about how much you have, and the machine check on the generated lines makes sure the joke never lands on that. What 金 points at is the arithmetic, not the balance.
What a head full of it looks like
Checking the balance before checking the weather. Knowing the cost of the trip more precisely than the date of it. Doing a small conversion in your head every time you pick something up. A head led by 金 is a head running a calculator in the background.
Words that use it
お金 (okane, money), 金額 (kingaku, an amount), 料金 (ryoukin, a fee), 賃金 (chingin, wages), 金曜日 (kinyoubi, Friday), 金魚 (kingyo, a goldfish — literally a gold fish).
Kanji it turns up with
課 (tasks) and 締 (deadlines) often come second, which reads as work. 推 (a favourite to root for) coming second reads as something else entirely, and the quip will usually notice.
Where “金” comes from
The old form shows lumps of metal under the ground, with a roof-like shape above for the sound. Two dots inside are the nuggets themselves.
It means gold first and metal in general second, which is why it heads the radical for every metal-related character: 鋼 (steel), 銅 (copper), 針 (needle), 鍵 (key).
It is also the character for Friday in Japanese (金曜日), because the days of the week are named after the five classical elements plus the sun and moon. Friday is metal day.
A line you might get for “金”
“Doing the sums again. The sums have not changed.”
Count the “金” in your own headOthers in “Appetites”
“金” is filed under “Appetites”. These are the rest of that group.
The 36 kanji
This is entirely a joke and has nothing to do with any real person.