In spoken conversation, a "spelling alphabet" is a useful tool for making sure that the listener understands exactly which letter is which. Did he say m or n? Did she say b or p?
In military speak, for example, the word "cat" is spelled "Charlie Alfa Tango" - each word starting with the letter it stands for.
In everyday speech, you're more likely to hear spelling alphabets used in casual ways, such as: "That's b as in Bob."
But Bob is boring. If you're going to spell something for someone, at least inject some pizzazz into it. Here, then, is the official Alien Robot Zombie spelling alphabet:
A as in Alien
B as in Batman
C as in Cobra
D as in Diesel
E as in Epic
F as in Football
G as in Gorilla
H as in Hammer
I as in Ice-Age
J as in Jedi
K as in Kung-Fu
L as in Laser
M as in Magic
N as in Ninja
O as in Overlord
P as in Pirate
Q as in Quasar
R as in Robot
S as in Science!
T as in Tyrant
U as in Unicorn
V as in Venom
W as in Werewolf
X as in X-Ray Vision
Y as in Yoda
Z as in Zombie