I learned this as “earthly mother… nine pickles.”
The version I learned goes:
Now, I will a rhyme construct,
by chosen words the young instruct.
Cunningly devised endeavour
Con it, and remember ever!
Width in circle here you see,
Sketched out in strange obscurity.
…which gets you to 30 digits!!
Grim
My Very Expensive Mercedes Just Smashed Up Near Pymble
Planets, and it’ll only make sense if you’re from Sydney, Australia.
Ex Machina, does it help if I mention that “Canberra” is pronounced more like “canbra?”
When I was on the quiz team in high school, our coach gave us a few to remember some geography facts, which countries share which boundaries, and so on:
Mary Ate The Little Eels: countries in North Africa (Morocco, Algeria, Tunisia, Libya, Egypt)
General Electric Has New Corporate Rating Procedures: countries in Central America (Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica, Panama)
Never Smoke Fish: Norway, Sweden, Finland
And one other:
- Pilgrim’s Progress*, by John Bunyan. Remember a bunch of pilgrims who have been walking so long that they have bunyons.
The resistor color code (rather sexist and violent):
“Bad boys rape our young girls, but Violet gives willingly”
0=Black
1=Brown
2=Red
3=Orange
4=Yellow
5=Green
6=Blue
7=Violet
8=Gray
9=White
Great Lakes: HOMES (huron, ontario, michigan, erie, superior)
Testing a typewriter: The quick brown fox jumped over the lazy dog.
And I’ll never forgive my bio prof for remembering the difference between eukaryotes and prokaryotes. Eu-kary-it in a bag (i.e. nucleus).
And my least favorite and most useless (if you can’t remember this without thinking, hire someone how knows how to use a wrench or screw driver!): Righty tighty, lefty loosey
There were more, but I’ve forgetten them.
Heh, in veterinary medicine, the cranial nerve mnemonic was slightly different:
Oh, Oh, Oh, To Touch A Fresh Virgin Girls Vagina - Ah, Happiness!
and the cranial nerves are
Olfactory, Optic, Oculomotor, Trochlear, Trigeminal, Abducens, Facial, Vestibulococchlear, Glossopharyngeal, Vagus, Accessory, Hypoglossal.
And I even still remember what they all do. Obviously an effective mnemonic 
The Great Lakes, maybe?
My favorite is one I came up with myself for remembering Roman numerals, which are, from smallest to largest, I, V, X, L, C, D, and M – or, ivy, excel, seedy, and M.
For Grammar: “Keep your hands on your genitives” to remember what the genitive case is.
For emergency combat first aid/triage, check for and treat in the following order:
Responsiveness really
Breathing beautiful
Bleeding babes
Shock should
Fractures f__k
Burns by
Head Injuries headlights
Um…gee. Thanks Drill Sgt.
Arabic:
"Jareeda the newspaper today? (Jareeda=newspaper)
“Wirka it baby” (irka = hips)
On the music theme, there’s the strings of a guitar: Elephants And Dogs Giggle Before Eating; and how to tell what key a song is in by the number of sharps, starting with zero: Cool Girls Don’t Ask Excited Boys For Cookies.
On the geographic tip, I always remembered Montevideo, Uruguay by something like “You’re at Monty’s Video Store.” When seen side by side, Vermont looks more like a V than New Hampshire does, and my friend Ann was from Maryland, making the capital Annapolis.
I’m sure I have more … but I can’t remember them. insert cheesy comic rim-shot here
Working a job makes money. A job very happily toiled pays twice.
I made this one up for the first twelve presidents of the U.S. (Washington, Adams, Jefferson, Madison, Monroe, Adams, Jackson, Van Buren, Harrison, Tyler, Polk, Taylor)
If you can add an F-P-B-L phrase it will get you all the way to Lincoln. (Fat paychecks beat laziness?)
Periodic table:
Li Be B C N O F Ne
“Liebeebuhcuhnoffknee”
Na Mg Al Si P S Cl Ar
“Nahmigalsipsklar”
repeat them often enough, they start to sound like real words.
Hebrew:
If he is she, then who is he?
Chemistry:
POTassium is sold in Kilos.
Biology:
A and T (adenine and thymine) match because A and T have sharp edges. G and C go together because they have curves.
Math:
All Students Take Calculus. In the first quadrant of a cartesian graph, all six trig functions are positive. In the second quadrant, only sin and cosecant are positive. In the third quadrant, only tan and cot are positive. In the fourth quadrant, only cos and secant are positive.
Latin:
The GNC Rule: adjectives must match nouns in gender, number, and case.
Dr. and Mrs. R.D. Vandertramp
The verbs in French that, in the past tense, are conjugated with etre instead of avoir.
I haven’t studied French in a couple of years, so I only remember a few of them–mourir, aller, etc.
And the one I made up 30 minutes before my astronomy final last night: TeSTEs (thermosphere, stratosphere, toposphere, and exosphere).
To remember the basic and positively charged amino acids (at physiological pH):
HIStory Likes ARGentina because it’s basically positive (Histidine, Lysine, arginine)
The acidic and negative ones:
I ATE acid and it was bad (negative) - glutamATE and aspartATE
I actually had other mnemonics for the rest of the amino acids, but I only used them for the one course, 3 years ago. Those two have stuck with me, though, and I’ve used them.
For Spanish, I remember “you can’t lay low in Mexico,” because when you have lo/la/las/los as the direct object you can’t use le for the indirect one.
To remember the guitar strings, I decided on “Elephants Aren’t Dumb; God Blessed Elephants.”
I’m kinda weird.
the nasal sounds in French: un bon vin blanc