The most frequent piece of online reputation management advice I offer to friends, family, and strangers on the street is to always be careful what you put online, especially in a public forum such as Twitter. Sadly, one UK man had to learn this lesson the hard way.

According to the Telegraph, a man found himself in handcuffs last week under the UK’s Terrorism Act for sharing an allegedly threatening message on Twitter. Wondering what he said? In an attempt to make light of a snowstorm causing possible airport delays, he tweeted the following message: “Robin Hood airport is closed. You’ve got a week and a bit to get your shit together, otherwise I’m blowing the airport sky high!!”

A few days later, police tracked the 26-year-old man down and arrested him, producing a printed copy of his Twitter update as they locked in the cuffs. Though the man was eventually released on bond after seven hours of questioning, the investigation is ongoing and he has had his laptop, home computer, and phone seized. According to the Guardian article, he has been issued a lifetime ban from the airport in question.

While I empathize with this guy, and I hope that the investigation clears him of any wrongdoing and lets him carry on with his life, his mistake gives us a stark reminder that what we share online isn’t just seen by our friends and family. Granted, the odds of police knocking down your door because you tweeted an inappropriate joke are slim (unless you’re joking about bombs and airports of course). However, the odds that your boss or your co-workers might see it and be offended is considerably higher.

Taking time to think about what you should and should not share online is an important first step in ensuring you don’t seriously tarnish your reputation. In a culture where oversharing has become the norm, this can be a difficult proposition, but it’s something that we should all work toward.