I always used the mnemonic "TRouBLe" to remeber the order.
There was another one for a different CSS thing (that I'm blanking on) that was based on the word "love" or something like that...
LoVe HAte, the order of pseudo classes:
:link
:visited
:hover
:active
That's it! Thank you!
I'm starting to suspect that CSS was invented by Taylor Swift.
Makes more sense, I always forget, which is why I looked it up, but apparently I either misread something or I can't remember it for longer than 2 or 3 seconds.