Because 12 13 14!
They are afraid of the Reposte.
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Three. One to post it, the second to post a better punchline in the comments, and the third to complain that it's a repost.
I have no idea because the actual joke is always in the comments.
It's not like they had to be there...
One of them can read, and one of them can write. The third one is there to keep an eye on the two intellectuals.
Because he only had 12 followers.
A fungi to hang out with
Nin, ten, "....I'll leave now.
11, because it has another one.
Missile Toe!
Because Dracula was coffin. Source: A Laffy Taffy wrapper.
One, but it will take 13 attempts.
Because OMG, they like LITERALLY can't even.