Learn the alphabet, League of Legends style!
A for Atma's Impaler
B for Blackfire Torch
C for Crystalline Flask
D for Deathfire Grasp
E for Elixir of Agility
F for Feral Flare
G for Greater Stealth Totem
H for Heart of Gold
I for Ionic Spark
J for Jaurim's Fist
K for Kitae's Bloodrazor
L for Leviathan
M for Mana Potion
N for Netherstride Grimoire
O for Oracle's Elixir
P for Philosopher's Stone
Q for Quill Coat
R for Ranger's Trailblazer
S for Sanguine Blade
T for The Brutalizer
U for ... uhhh... Udyr
V for Vision Ward
W for Will of the Ancients
X for Xerath
Y for Yordle Stompers (brutal)
Z for Zephyr
Note that this learning method might be a little outdated

is still around though