My presentation friend David Upton introduced me to this concept.
If it’s bleedingly obvious what the picture is, don’t put a caption on it, the audience will think you’re doubting their intelligence.
Here’s an example:
There is plenty of good information on how to apply captions here




February 23rd, 2010 at 3:22 pm
Clearly that is a picture of a beach.
February 23rd, 2010 at 4:38 pm
Imitates *John Wayne*
“Yep”