In fact, there's probably few things funnier on a ski slope than watching an ownerless ski or board going down by itself. Unfortunately, there is also nothing more dangerous than out of control equipment flying down a trail like an unguided missile, ready to knock over or impale somebody in the wrong place at the wrong time. Make sure the brakes on your skis work and be sure to use the runaway straps on your snow and ski boards. Not only are you helping to prevent an injury, you'll be sure to get your equipment back if it gets away from you. Keep off closed trails and out of closed areas.
Problem is, trails are usually closed for very good reasons.
Most times, at least in resorts east of the Mississippi, it's due to lack of coverage. Other times, especially in the Rocky Mountain resorts, it may be due to too much snow. Either way, ducking that closed sign can result in disaster. If there's not enough snow, you may find yourself hiking out with the Grand Canyon carved on the bottom of your skis or board from all the rocks and debris on a thin trail. If there's too much snow, you may get caught in an avalanche and become a permanent part of the scenery.