Revising for the <a href="http://www.dcs.gla.ac.uk/courses/teaching/level3/modules/gmm3.html">Graphics & Multimedia</a> (GMM) exam can be a serious pain. 
Thankfully, <a href="http://www.mrry.co.uk/">Derek</a> is on hand with a useful memory aid.

Derek:	i have an mnemonic for a part of gmm, that you might find useful
Matt:	fire away
Neil:	share with the class
Derek:	you know when you're looking at fishnet porn on the interweb?
Matt:	I'm going to say "sure" in order to move this on.
Neil:	no *
Neil:	*yes
Derek:	and you click to see the full-size picture, but the browser does that shitty thing of resizing it to fit?
Neil:	yup
Derek:	and you look at her legs, and something seems wrong?
Derek:	that's the nyquist sampling limit.
Matt:	right
Derek:	either that, or you're looking at cripple porn. and that's not my bag
Matt:	so the take-home part of that is: resized-to-fit fishnet porn leg distortion = nyquist sampling limit
Derek:	yep
Matt:	got it.
Derek:	you're seeing spurious low spatial frequencies
Neil:	interesting
Derek:	due to aliasing
Derek:	it's a pain
Derek:	i can't look at it now without thinking of gmm :/
Matt:	it must ladder those fishnets something awful too.