It's not a matter of not remembering it, but sometimes background process (think sync) will make the interface completely slow to respond.
Last week I was trying to enter my pattern, and I swiped it as normal - and it entered 3 incorrect swipes successively, as it entered the first 2 dots then gave me an error about being the wrong pattern, skipped the 3rd dot and entered the 4-6th dots, same error, then entered the last dot and again gave me the error message. I turned off the screen and waited a couple of minutes and tried again and it took all 7 dots the first time. I've been using the same swipe pattern since I enabled it way back when when it was first available to me, so I know I didn't forget it - bu as you can see, the phone was simply not able to respond fast enough to my super-fast swiping, and I almost had locked my phone.
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