Laughter, like irony and sarcasm, is strictly forbidden. We just make up random doodles, and hope everyone feels foolish when they can't read our minds. You're at our mercy, at our whim, doomed to despair. Hopefully we don't have to strain the conceptual connections too much in order to create any specific puzzle. For more detail, we have a whole separate page for this topic.
Every subscriber gets a personalized, random-like sequence.
There's a chance that two people get the same brainy puzzler on the same day, but t'ain't very bloody likely. And if it does happen, it won't be very often. Right, we're making these up as we go. For the most part. Size might matter.