To make the challenge especially stimulating for the brain, there’s a time limit; see if you can decipher all of the “odd ones out” in just 15 seconds. If you succeed, you can count yourself among the upper echelons of highly observant folk.
Accept the challenge! Good luck!
How did you do? Let us know in the comments and challenge your friends to these tricky quizzes to see if you can outdo them!