The odd one out

Challenge #1 in the Visual versus Frontal Cortex series. Hosted by Xscream.
Challenge has finished
Find something repetitive, with one exception. For example a lot of apples with one pear, orange flowers with just one yellow one in between, or some young people with one old person in their middle.
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133 entries
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2726 votes
old trucks
Red.
Isolation
I got the Blue
Behind Schedule
Bocanera.
Against The Flow
Purple
Yummy!
2th by air. 1th  by water.
Exam passed
Ballet Recital
Dude!
Survival
Happy Outsider
5 / 10
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