I FOUND MORE GREAT ONES!
I like this one:
How many black dots are pictured?
Are the stairs right side up, or upside down?
Here's one like the Elephant one:
Can you see the word "Liar" written on this face?
[IMGhttp://utter-bollocks.imess.net/m.gif[/IMG]
How many people can you see?
Can you see the animals?
How many people can you see?
AND FOR MY ABSOLUTE FAVORITE!
Stare at the four dots in the middle of this picture for 30 seconds, without blinking. Then close your eyes and lean your head back, facing a source of light. What do you see?