Greyhound's new low-cost buses, with Wi-Fi

As a stunt, the group Improv Everywhere recently brought folks to London's Trafalgar Square. On a secret cue at 3:30 p.m., all of the volunteers stood motionless in various poses. This video shows the startled reaction of tourists and passersby: You can learn how to participate, or create, similar events nationwide at ImprovEverywhere.com.

This past weekend, Delta began putting red tags on approved carry-on luggage for international flights. It's the first airline to try to tamp down on cheaters—(You know who you are!)—who ignore an airline's carry-on luggage limits. Items that are found by flight attendants and that are not red-tagged will be removed for gate check. No fines are being put in place, though, for breaking the rules. For its overseas flights, Delta allows each passenger to bring one bag whose length, width, and height adds up to less than 45 inches and whose maximum weight is 40 pounds. It also allows each passenger to carry an additional, smaller item, such as a purse or laptop bag. Many travelers flout the rules, carrying aboard additional items that clog up overhead compartments. These rule-breakers cause problems for other travelers. When other, rule-abiding passengers board an airplane at the end of the line, they often find there is not enough room for their items in storage. Their carry-on bag must then be checked at the gate. If this has ever happened to you, and you have medicine or other important items in your "legal" carry-on bag, the experience of having your bag gate-checked can be infuriating. And Delta told the Atlanta Journal Constitution that it has no plans to start the policy on domestic flights. EARLIER Radio-tagging luggage at Heathrow Airport may prevent luggage from being lost.

Imagine if you could leave your cubicle behind and travel the world for a year. That's what Brook Silva-Braga did when he was 25. Along the way, he videotaped parts of his experience, and he subsequently produced a documentary of the trip. The show hits the air this Saturday, March 1, at 10 p.m., on MTV. Last year, Brook gave Budget Travel this first-person account of his round-the-world adventure. Check it out.