Re-calibrating, do you do it?

Does anybody here re-calibrate their DS (look in options in the home menu)? I never have needed to, I get bored though so I have done it from time to time. Also what can cause it to be uncalibrated?

You want to know if i calibrate my DS? what's next? My name, ID, fone, credit card number, shoe size?

Hehe, I'm joking.

I never had to recalibrate, i guess you only need to do so when your screen gets calibration problems, that possibly happens if you touch the screen too hard, pushed the touch-screen or dropped your DS.

I don't need to do it (clicked No), but I do it just for.. 'fun?' from time to time.

No idea how calibrating would be fun. Couldn't find another word :)

Come to think of it, I've never really needed to re-calibrate it. I calibrate it for fun sometimes even if it isn't broken. ^^