I've pondered this. After due consideration, the Academy Award goes to #6. From a technical perspective, it was one of the hardest images to capture. The sign is tack-sharp and this was done very well.
As for the others:
#5, #10 and #15 were all funny. #5 takes home the best performance in a comedy award.
#13 wins the Academy Award for best image in a slasher flick (gruesome).
#17 wins the WTF award, with #4 the runner-up.
--don