This is - without question - the best optical illusion I’ve ever seen…
If you stare at the image long enough, you should see a giraffe.
Don’t post the spoiler. 
Feel free to add some of your own optical illusions to this thread.
~Cameron
Wow I totally see it that’s incredible, it’s amazing what the power of suggestion can do
That’s funny.
Cathy
I had to squint and change the angle of the laptop screen but it really worked!!
Cool. V. cool.
ehh? it jus tpops up after 17 sec its an animation I think
I’d appreciate if you would edit your post and remove the spoiler.
This thread is meant as a joke. 
~Cameron
I guess maxisback came back without his sense of humour.
Cathy
Jeez, that scared the crap out of me. I had my nose up against the screen, then BAM! there it is!
This one takes a while to see, but when you get it it will make you crap your pants. 
http://www.ripperd.com/ftp/admins/whatswrong.swf
This is a car advert from central Europe. When they finished filming the ad the people who made it noticed something moving along the side of the car, like a ghostly white mist.
HOLY SH*T!!! tHAT’S ALMOST BETTER THAN MINE!!!