Useful list of things to say when asked to switch seats
 

I request aisle seats because I have long legs and reserve them well in advance and really do not want to switch. That middle seat 34 rows back would be much more cramped and uncomfortable for someone my height.

Don't say a word and become deaf; or don't speaka da lingo

No thank you.

"I booked my seat 10 months ago!"

"That will be $3000 please" (or 1/2 of what ever price you paid for your ticket in in F/J)

"I don't speak English." (In any American accent.)

Great, I've already wet this one.

Ditto.

One valuable thing I've learned reading these seat switch posts here on Flyer Talk is a simple and polite "No thank you" answer is all that is needed here.

Anytime you respond with a reason why you don't wish to switch can sometimes open up additional unwanted conversation. You are not obligated to provide anybody with a reason why you wish to retain your assigned seat.

:D

I just say 'No thanks i don't want to move'

:D^

Me muestro el deniro!

I've got to say, that's the funniest and most original response I've ever heard. :)

Seriously, I think the response I use works fine:

"I'm sorry, but, no."

I prefer the simple, no, thanks... people tend to accept that answer.

I book mine well in advance, and use aisle seats simply because it gives me more freedom, leg room part of the time, not to mention I sit in the first couple of rows in the cabin and don't want to give that up, unless it's an upgrade...