Now, as of lately I've come to find that there seems to be a player a bit unlike the rest. Of course, it's fine, having different characters is always great but, in this one case, it seems quite off. 

Now I am in no way accusing anybody of being a bad player at all, I simply need GM help, so that if the time comes, I know what the problem is and how to deal with it.

Think for example, a character powergames, metagames, or is otherwise just seeming to be quite off track.. In faact, I'll make a situation for a few... Mainly cause I'm bored..

Like, say I make a trap for. The rpers alright? They're split up as of now, and I rp in a trap. The first person to respond, knowing oocly that said trap will affect them, their character suddenly knows of said trap, despite not having any reason to ICly, and goes from full speed rush to "alright time to be super duper sneaky beaky" how do I class this? What do I do in the OOC, etc.

The whole gang is in the middle of a big super duper ridiculously tense situation alright? Stuff is going DOWN, and it's BAD. I put in a few RPs from npcs or opposing parties, and it looks like things are going to turn sour, and then one character strolls in doing something that is just ridiculous for the scene. Think like whenever two armies are about to go to war, and one of the half naked dudes runs through tooting a horn and skipping with flowers in their hair. It throws a few RPs pretty off wack, and messes with the stuff you were trying to work on pretty bad. Now I understand an RP shouldn't be an on rails experience, MAY AS WELL WRITE A BOOK! But still, how would I work with this in OOC and other such things.

------------

In general just some tips on how to work with things like these, and they don't even have to be things like these, just ANY advice with dealing with people who are just screwing things here and there whether they know or don't know that they're doing it.. In fact, if you have personal experience, please, info dump it you want.