How do you know if someone's pulling your leg?

On Fluther, how do you know if someone’s pulling your leg, especially an OP?

There’s been a few questions lately that seem legitimate on the surface, although the details also seem to be rather grandiose or far-fetched, or just maybe a little bit unusual. Or maybe it’s just that the scenarios seem a bit outrageous, mostly due to how the OP has responded to their own scenario outlined in the Q, or how the OP has responded to some of the answers received on their Q’s?

Sometimes I start out thinking that a question and the OP are legitimate, but then after I read some of the responses to our answers, or often a lack of response to certain answers, I get the feeling that the OP is possibly trolling, or may be mentally ill, or maybe just plain immature and possibly playing a joke, or simply looking for attention.

I really have no way of telling for sure, so I have to go with my gut instinct, but in the past I have been scolded by certain Jellies, who didn’t think it was right for me to dare to suggest that an OP might be a troll (even though I have found out later, that I have often been correct). Since they, and I, have no way to know for certain (until we do know for certain) all any of us can do is to go by our own set of skills and instincts.

I’m not sure why certain Jellies get into a huff at the idea that we might have trolls amongst us. Just look at all the spam we get on a nightly basis. No one scolds anyone for suggesting that certain Q’s or Jellies are spammers. Are we supposed to treat trolls with kid gloves?

If there is a way to determine, immediately, who is or is not a troll, I’d sure like to hear about it?

What do you do when you think you’ve spotted a troll?