Guzzling a gallon of tequila may be fun for a while, but eventually, it's going to make you feel like hell. The same is true of all faux-fun pursuits: You can identify them by their wretched aftermath.
The discomforts of alcohol abuse are obvious, but all faux fun creates a hangover. Have you ever had a conversation that seemed enjoyable but left you feeling wary or uneasy? Your instincts are telling you that at least part of the fun was false. I've experienced this after interactions where either I or some other person was dishonest, mean-spirited or passive. Often, I didn't see the problem until a disturbance in the Fun Force prompted me to identify and change my behavior.