Why is it that you can't choose what you want to remember? I have an innate talent for remembering useless Simpsons quotes, for example - but I can walk to the other side of the office and forget what I was going over there for.
Take reading. Read a book - five minutes later, you don't remember the words you've just read. Sure - you might have a general idea - you might have the gist of what was written (unless of course you've got a test on it - in which case it all seems to evaporate to somewhere) - but the specifics are gone.
How about this blog? What was the second sentence I wrote? (no looking!). Already it's probably gone. You had that knowledge, but somehow your brain decided it was unimportant - chucked it in some dusty corner and shut the door.
Stupid brain...I think I'm going to go back to killing you with alcohol.