Sorry, this isn't actually a knock knock joke. :P
A Muslim, a Jew, a Pagan, a Christian and an Atheist walk into a coffee shop... And they all sit down, have a cup of coffee and become friends.
It's not a joke, it's what happens when you're not an asshole.
Feel free to share a joke if you like!
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How do you know if someone is a vegan by looking at them?
You do not, they tell you as soon as they meet you1