When a player or DM is turning on you, there's usually signs.
If the adventure is spiraling into bullshit land, there where probably indications of that along the way.
Should your group shatter between sessions, maybe you should've seen something going on.
This thread is deticated to the warning signs that spring up to alert you of approaching danger. Some signs are widely known while others are lesser or even unique to an individual group or gamer.
Knowledge of these signs can help you get ahead of danger and prevent disaster, or at least make sure your not at the session when everything explodes.
Important notes:
1) These red flags don't always come before a total and complete melt down of gaming, they might just be a good warning sign that your about to waste time.
2) Not all red flags apply to all groups. Some people will have these flags present but have worked around them to the point that they aren't in real danger of harming the game.
Some examples include:
The environment- No table; unproductive music selection; distractions abound (like shinny objects).
The players- Didn't bring essental supplies; one of them is that guy you hated in high school because he was a dick (and probably hasn't changed); two or more players are involved in romantic relationships with each other.
Or the GM- Is a Grognard; not focused on players and game; is a relative.