足够

足 = 龰 + 口 : Mnemonic symbol: a football. Zapatista Zebra (zu) wants to pimp his football (足) in the space station's kitchen (Ø2). He thinks that a few more vitamins wouldn't hurt, so he extracts the vitamins from a mandarin (口) with a syringe (龰) to inject them into his football.

够 = 句 + 多 : Guy Fawkes (g), the grammar nazi (句) and Manny Kant (多) want to play sheepshead in the outhouse's bathroom, but they're not enough (够) people. They are only enough (够) for skat.

This mnemonic may be a little lame, but it has to be enough (够). I have been thinking about the above sentence (句) many (多) times.