What if?
Original idea by @DonnKing. I've used this before recently, but it's a perennial favorite. ;)
1. What if we were herbivores?
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Would our society be more peaceful then?
2. What if our bodies didn't have a natural expiration date?
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Like Tolkien's Elves.
3. What if we were only a meter (three feet) tall?
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Would we then have succeeded in hunting mammoths and subjugating nature with its lions and tigers?
4. What if we were hermaphrodites?
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Like the residents of Ursula K Le Guin's Winter Planet.
5. What if the concept of humor didn't exist for us?
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Other animals don't seem to know it.