Today, I was doing an experiment involving high-speed
photography. Since the camera had to be kept stable at an odd
angle, I couldn't look at the screen or the viewfinder, and I
couldn't press the shutter manually. So I used a tripod and a
wireless remote control.
It took me most of the morning.
Then, when I tried to retrieve the photos from the SD card, they
were all black.
It turns out that I had forgotten to remove the lens cap.
FML. 
Woah happened to my dad once too. We posed for family photos all
morning during Chinese New YEar only to realise that year all we
took was blaaaaaccckpicturess :P