It didn't.
It repeatedly did it, and then I didn't know what to do. Tried to hit something else to open, and it didn't work. The touch screen has died, or the motion moved and wasn't picking anything up anymore. That or it was severely lagging and wouldn't register, because the buttons wouldn't respond either. My contract ends in March '11 and roughly 1.5 years old.
Now it works 1/4 of the time 8|........ Took it to the shops, they didn't help. There were two shops in the vicinity. First one requested I went to a phone specialist shop, the 2nd place tried to help me at least (had no idea what the master reset pwd was LOL) and then finally said probably needed to see someone about it and gave me a different place to go to. Since I wasn't sure if I had warranty on my phone, nor where it went, it would probably cost me $200 they said. Woo. Screw that, I went to eBay and went to buy my old phone's charger for cheap. My cousin had borrowed my phone before and lost the charger.

Didn't read the fine print to the cheap price: 12-24 days to reach me. UGH. Great.
Current situation, as I wait for my charger, I am dual-wielding two phones. Samsung F480 so friends and work can contact me, and my Mum's iphone (she has two phones!) so I can sms to a few ppl and recieve a few calls - can't call or sms too much because it's another company and iphone is damn expensive!!
Pretty gold korean limited edition iphone :D But because it's not mine, I have no pwd, nor what it is, so can't install apps TT__________TT so it's pretty basic and bare. But yeah, it's pretty fun. Although it's got really shitty battery life. One dilema was my F480 stopped working and I needed to call someone urgently and then the iphone decided to DIE on me because it said full battery and wasn't counting down for some reason and suddenly became 10% ARGH. Lucky F480 worked after two minutes of hitting it = =|||
Now thinking of what phone to get next year.

Htc Desire ranks pretty high on my list atm :]
I'm not an apple fan.
I'm not an apple fan.