The best mnemonic device I've ever come across is the one for the 12 cranial nerves.
All the docs on here, and 
@Just Gina know what I'm talking about.
Oh, oh, oh, to touch and feel virgin girl's vagina, ah heaven.
- Olfactory nerve: Sense of smell.
 
- Optic nerve: Ability to see.
 
- Oculomotor nerve: Ability to move and blink your eyes.
 
- Trochlear nerve: Ability to move your eyes up and down or back and forth.
 
- Trigeminal nerve: Sensations in your face and cheeks, taste and jaw movements.
 
- Abducens nerve: Ability to move your eyes.
 
- Facial nerve: Facial expressions and sense of taste.
 
- Vestibular nerve: Sense of hearing and balance.
 
- Glossopharyngeal nerve: Ability to taste and swallow.
 
- Vagus nerve: Digestion and heart rate.
 
- Accessory nerve: Shoulder and neck muscle movement.
 
- Hypoglossal nerve: Ability to move your tongue.
 
Totally admit I had to look up the actual nerves, I only remember the mnemonic.