OBAFGKMRNS - The best of Ay 20 from the bygone years:
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Only Bored Astronomers Find Generally Kooky Mnemonics Really Nifty Stuff 

Obese Balding Astronomer Found Guilty; Killed Many Reluctant Nonscience Students

Often Budding Astronomers Find Guzzling Kegs May Ruin Night Seeing

Oh Bloody Astronomy!  F Grades Kill Me (Rotten, Nasty Stuff)

Older Brothers Are, For Girls, Known Menaces (Reason Not Specified)

One Bureaucrat and Forms Galore Kill My Research

One Bed And Four Girls/Guys Keep Men/Misses Really Nicely Satisfied

Oh Big And Ferocious Gorilla, Kill My Roomate Next Saturday

Only Boring Astronomy Freaks Get Kicks Making Risque Mnemonic Sentences

One Banished Administrator Finds Great Komfort Masturbating

Old Bald Astronomers Fondle Girls Kindly (Masterly?), Reciting Nocturnal Sonnets 

Obliging Boys And Fast Girls Kause Much Raging Nude Sex

Only Blind And Frumpy Girls Kiss Me (Right, No Sex)

Only Balding Aligators Float Gayly, Kicking Mud

Only Bond Asks For Goofiest Known Martini (Ruined, Not Stirred)

One Buxom American Flirted Gregariously, Keeping Men Right-out Numb, Senseless

Our Bad Astronomy Faculty Gets Killed Monday (Really, No S---!)

Our Brains Are Finally Gone Kaputt, Mostly Raving Nonsense

Only Because Astronomy For George Kills Me! (Really Need Sleep!)

Our Beavers Athletically Fail, Get Killed, Making Record No-win Streaks

On Battleground Against Foes, Gallant Knight Murders Rampantly, Neglecting (homework) Set

Only Boring And Freaky Guys Kiss My Rabbit Nasty Styles