Funniest thing happened to me today: My son has a two foot tall rubber T-rex that I've been too lazy to bring in from the van.
Today I brought it out and put it into our room right in front of the door so that when it was opened he would see it and I could get a good reaction.
I forgot I put it there.
I opened the door and yelped like a little girl, my first thought being "What the hell is this cat doing in here!"
Then I laughed at my own stupidity. For like, two minutes.