As someone whose last name ends with double f's, I grew up hearing my parents tell other people, "'f' as in Frank, 'f' as in Frank" whenever getting the spelling right was important. This comes up in life more often than you think, and there are certain letters in the alphabet that sound distinctly and consistently like another letter altogether. I can't tell you how many times I've run into lost reservations or communication errors simply because "'f', 'f'" sounds a lot like "'s', 's'".
Just about the time I hit college, I took on the "'f' as in Frank, 'f' as in Frank" thing... but over the years have decided to spice it up from time to time. It's all about avoiding monotony, really. I have actually used the following replacements for "Frank-Frank":
"'F' as in fo'shizzle, 'F' as in fo'shizzle"
"'F' as in festivus, 'F' as in for the restivus"
"'F' as in finger guns, 'F' as in finger guns... pew pew (childlike gun sounds)" (using this one when face-to-face with someone is most effective. I highly recommend putting it to use at fancy places, topping it all of with a little wink at the end.)
"'F' as in Fight Club, 'F' as in Fight Club... but we do not talk about Fight Club"
"'F' as in effing get this right, 'F' as in if you eff this up I will hunt you down in the darkness of night"
It's the little things that make me giggle.
When I saw The Unhelpful Phonetic Alphabet earlier today over at The Ragbag it made me laugh so 'f' as in freaking hard that I've only stopped long enough to share it with the rest of you!

I really, really wish my name had a 'd' in it so I could say, "'d' as in double-you".
I can already hear myself making reservations for Jeremy & I:
"Yes, Mr. & Mrs. Jeremy Piven. 'P' as in pneumonic, 'i' as in ichthyoacanthotoxism, 'v' as in vajayjay, 'e' as in effect, 'n' as in naughty."
Naughty, indeed!
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