Are you a F is for Flash fool!
OR
Flash on D because F is for fire? (or d = distance)
Personally I put my movement ability on D because distance, and F is for fire. But there's quite the debate about it, so have at each other :D
Flash on D. Because its more convenient due to the way I hold my hand. If you're wondering, yes, I keep my index finger on E. When I need to ult, I simply wiggle my finger over to R.
... It's a counter-measure to accidental ults. It's better to accidentally E than to accidentally R.
Shaco needs no flash
flash is for the weak
I started with ghost on d, and when I began trading out ghost for flash, flash went on the same spot. So it's just always been D for me.
i put flash on f because i can use my index finger alot more accurately and alot faster than my middle finger
Well there are advantages to both. D can often be pressed very, very, very, very, very, very, very, very, very, very, very slightly faster. But if you put it on F then you can have ignite on D and give people the D. Decisions decisions.
F is for fly no? and D for dance? i don't get it! lol i am the D(flash) and F(ignite) player 
D = movement spell F = cast spell
This way I can never forget/mess-up. So say I'm jungle Nasus for whatever reason. I'll run ghost D and smite F.
I put my flash on d because I don't know why but I always tap the key with my index finger anyway so either way it doesn't mattter
Putting flash on D is for people brave enough to risk accidentally flashing while trying to type. Anybody else is a coward.
for me, d is for the more commonly used summoner spell, or the one which goes first. So if I have smite I put flash on f, but if I have ignite or some other summoner, I put flash on d.
I have Flash on F because when I was learning how to play I'd always misclick D, so if I had Flash there I'd always Flash for no reason. Now I've just gotten used to having Flash on F. I also have it this way because I use it way less than the other summoner spell due to its large cooldown and I also use ultimates less. R is right above F. xD Then there's the rogue game where I have smite and exhaust as a jungler.
Umm, i would go for flash on F because i carry ignite. My finger usually slips when i get excited for a kill and if i have it on D, then i just wasted my flash. But if ignite was on D i will have to click on someone to activate the ability. But this is just me. I normally don't slip my fingers but it a safety precaution. I don't want to flash in a bush by accident when i can flash over a wall.
= F
Flash on D. It's just like when you were a kid deciding if you were left or right handed. It's whatever you started using first you stuck with it. When I started with Ghost Heal it was ghost on D and heal on f. I unlocked exhaust and switched out heal. (always wanted a movement enhancer.) I kept ghost on d until I unlocked flash which replaced ghost on D and there it has sat ever since.
