Remembering Facts, Names, Sequence

Mnemonics

I remember that when I am studying science in school we were asked to remember a few things such as the colours of the rainbow, the sequence of the planets and the colour coding for resistors. 

To help us remember, our teacher tell us about mnemonics. What is a mnemonic?

From Wikipedia...
A mnemonic or mnemonic device, is any learning technique that aids information retention. Mnemonics aim to translate information into a form that the brain can retain better than its original form.

Example of a mnemonic that I can remember is the colours of the spectrum or rainbow:

Royal Of York Gave Battle In Vain 

which helps us to remember the sequence of colours 

Red Orange Yellow Green Blue Indigo Violet

but some of us just memorize the word VIBGYOR (although it need to be inverted to get the right scientific order)

There are also the Bahasa Malaysia versions. Examples are...

Mari Jual Kacang Hijau Biar I Untung
Minah Janda Kaya Hanya Beli Ikan U

to represent Merah Jingga Kuning Hijau Biru Indigo Ungu

Another memorable subject matter to use mnemonics is the sequence of the planets
Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto

Example of mnemonics used are...

My Very Earnest Mother Just Showed Us Nine Planets
My Very Educated Mother Just Served Us Nine Pies
My Very Eager Mother Just Served Us Nine Pizzas

There used to be 9 planets including Pluto but now Pluto is downgraded to minor planet. Therefore examples of the 'updated' mnemonics are...

Mean Very Evil Men Just Shortened Up Nature
My Very Educated Mother Just Served Us Nachos

Other very interesting mnemonic that I found at Wikipedia includes...

Lifecycle of cells...
Interphase, Prophase, Metaphase, Anaphase, Telophase, Cytokinesis
Idiotic Penguins Make Antartica Too Cold

Electronic Colour Code...
Black(0), Brown(1), Red(2), Orange(3), Yellow(4), Green(5), Blue(6), Violet(7), Gray(8), White(9), 
Bill Brown Realised Only Yesterday Good Boys Value Good Work

Geological periods ...

Precambrian, Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous:

Pregnant Camels Ordinarily Sit Down Carefully, Perhaps Their Joints Creak

Mohs scale of mineral hardness...

Talc(=1) Gypsum(=2) Calcite(=3) Fluorite(=4) Apatite(=5) Orthoclase(=6) Quartz(=7) Topaz(=8) Corundum(=9) Diamond(=10)

Toronto Girls Can Flirt And Only Quit To Chase Dwarves .

But one of the most interesting mnemonics that I come across is how to remember the constant 'pi'.

pi = 3.14159265358979

Now I need a drink, milkshake of course, after the heavy lectures involving quantum mechanics

(originally in college, it is 'alcoholic' instead of 'milkshake')

Please share any interesting mnemonics that you might come across...