When you see people who use D for Flash
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OCD to the max. F is for 
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D is easier to hit for me. Plus it is just naturally the one I put it on, so I got used to it. Besides, d is for dash.
What I always thought D was best for flash F is where yah secondary summoners go fam .
D is for dodge bullshit
Also just closer tbh
Been using d flash since beta and it's gonna stay that way until Tencent bans all all NA players.
d is for dodge or dash f is for
F is for Fires that burn down the whole town
D is for Derping into the wall
D for dash, F for fill.
Mouse button keybinding for summoner spells ftw.
NO D IS FOR DODGE F IS FOR FUCK SHIT UP GET IT RIGHT GAWD. DIDN'T PICCOLO TEACH YOU PLEBS ANYTHING.
F for flash D for De other spell
OCD to the max. F is for
Nope D is for distance.
F Is for fighting.
Since I don't run flash on every single champion.
I like flash on D its a lot harder for me to hit then f, also when i use f i need to target something so it easy to combo with 
then d
D is closer. So it's a perfect OMGWTF key for Flash. http://img00.deviantart.net/bfb1/i/2013/091/6/5/nothing_to_do_here_in_hd_by_lemmino-d6025yy.png
when you see people who use F for flash
FTFY
D is for dip set. Cause i am dip setting out of that moo foo.
If my fingers slip when I reposition my left hand on the keyboard, they'll more likely slip and hit F instead of D. It's a safety precaution.
D is for driving F is for f-ing up
D is for flash F is for de damages
D - Damage, Defense F - Oh F***!!!
my flash is on R O_O
ALL HERETICS!!!! F IS THE ONE TRUE KEY!!!
Forget you haters, I press D for flash out of habit!
F is for
D is for DENY 
F is for "Fire"
D is for "Dlash"