I don't find the picture funny, even though I understand all the bullet points from looking at the picture.
Yes, the man is confused because he's being pranked by the president. It would be funny if I was there.
But looking at this photo? It's not funny to me.
I suppose I would rank this picture a lot higher than a picture of a skyscraper in the list of funniest pictures, but neither would be above the "laugh" threshold.
Does everyone else here find it funny?