my ex-gf once completely lost her keys ... we came home to her place after work, watched tv, ate dinner, went to sleep, and in the morning the keys were NOWHERE.... we spent the next three hours turning the house upside-down. We got to the point where we became completely delusional -- there was nowhere the keys coould have gone!
I remember I actually looked in the refrigerator/freezer not once but *five or six times* ... just in case they could somehow be in there! We were starting to *seriously* entertain the ideas a) someone had broken into the house and stolen the keys or b) the keys had dropped into a gateway into another dimension. (By seriously I mean we sat down and had an extended, sober, discussion about these possibilities....... talk about delusional!)
Finally, we collapsed on the couch laughing because the situation was so ludicrous. We couldn't leave the house or go anywhere (including work -- we both worked at the same place) b/c she had her car and housekeys on the same ring (I lived really far away so we couldn't get to my place/car). We were literally trapped inside the house. We discussed the possibility that we would just have to stay in her house FOREVER.... We called in stupid to work and then called a friend to see if they could come and just take us to the store or something b/c we couldn't figure out what to do with ourselves and we had no food.
While we were waiting for the friend to get us, we decided to play scrabble, and lo and behold, the keys were sitting, perfectly centered, on the top of a stack of board games UNDERNEATH a table in the guest bedroom ... we hadn't played any games the night before or been anywhere near the table ... you figure it out!