The "rainbow" thread reminded me of the old trick for remembering, in order, the colors of the rainbow. You need only remember the name Roy G. Biv.

Red
Orange
Yellow
Green
Blue
Indigo
Violet

What other mnemonic tricks can we share?

Never
Eat
Shredded
Wheat

A very common one for students learning their cranial nerves:
1st On
2nd Old
3rd Olympus
4th Tiny
5th Tops
6th A
7th Finn
8th And
9th German
10th Viewed
11th Some
12th Hops

Olfactory, Optic, Oculomotor, Trochlear, Trigeminal, Abducens, Facial, Acoustic, Glossopharyngeal, Vagus, Spinal accessory, Hypoglossal

When I was in school, the teacher taught me this phrase to remember the order of the planets:

My
Very
Educated
Mother
Just
Served
Us
Nine
Pizzas

Great thread hic! I always thought the funniest mnemonic I ever heard was:

Fat Cows Get Dizzy After Eating Barley!

(That is the order of flats in a key signature in music!)

We learned the colours of the rainbow with the mnemonic Richard Of York Gave Battle In Vain.

Another, multilingual one, was for German prepositions taking the accusative case. Durch, für, gegen, ohne, um, wider - Does Fire Go Out Under Water.

Of course as wider is seldom heard and the mnemonic misses out bis and entlang it isn't really a very good one.

si hoc legere scis nimium eruditiones habes

Read all about my travels around the world here.

Welcome blues