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Hatch is on the side, so you would have to throw them very accurately. I always put a hatch on any decking with crawling room underneath, I cite the lost wedding ring/£50 note as the reason! This is also why all decking should be screwed together as nailed decking has to be virtually destroyed to remove or replace a board.
Far too serious an answer to a flippant question, but might be helpful to forum DIYers!
Ah, OK, let me correct: Now you can lose your keys down the specially-installed hatch and never see them again, right? :)