ZYX is obvious.
Then come the worst states in America: West Virginia and UTah. WVUT.
Now you’re no racist but “it’s our cue to pee on Martin Luther King!” SRQPONMLK.
Now it’s time to dance a JIHG. After all those letters you’re FED up.
And then it’s just CBA.
Back around 1980 in the UK Peter Eldin wrote a book for kids called The Whizzkid’s Handbook. It was very popular (there was a TV version with Kenneth Williams, and some further volumes) and filled with little memory, maths and magic tricks suitable for children. Anyhoo, it had a system for learning the alphabet backwards that was half gibberish but nevertheless imprinted fast and remains with me today (no doubt mutated slightly over time):