The blue one is the correct door.
Another thing that cracked me up was at arrivals in the airport in Abu Dhabi. How do they know they are walking away with the right one? lol I saw one guy walk up right up to one of them and kissed her (presumably a "her") on the top of the head, didn't hear any conversation beforehand. How did he know he was kissing the right one? They didn't have their IDs out like in the picture below.
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I was quite surprised when I was in Manila (Terminal 1 in the smoking area) and saw all the middle eastern Muslim guys dressed up in their Muslim man dresses (drinking beer and eating pork.....effin hypocrites. I've had one Saudi man, many years ago in Angeles City, tell me that "Allah can't see out of the Kingdom"). They were all giving me nasty looks and watching every move I made. Wanted to put a boot to their face for their nastiness and unwarranted hatred towards me. I only kept my mouth shut because I didn't know if they were going to the same destination as me.