This Brick Wall Optical Illusion Will Drive You Nuts

This is one excellent illusion. Once you see it, it will be hard to un-see it. Please don't spoil it if you do, just share it.

This is the optical illusion that's burning up on Facebook. All it asks is for you to spot something unusual on a brick wall. Is it a snake? Is it some other kind of reptile? I thought it looked like a baby otter stuck in the wall... and then after about 10 minutes... BOOM, I saw it. You'll be mad that you didn't see it sooner.

Scroll down to see it you cheater!