Bruce Willis did. People in a chat room didn't believe he was the movie star they'd seen on the big screen and DVD. So Bruce called the forum's sceptic on iChat video.

Bruce's gatekeepers keep unwanted intrusions to a minimum. A phalanx of secretaries, security personnel, agents, lawyers, publicists and-the-like guard Bruce and his family. Superstar celebrityville.

But in this case he wanted to bypass his protective walls and be known to the members of a chat room as the read deal. Lucky for Bruce, people in the room (fans, after all) had seen him in many movies and television shows. Also, he was lucky to have had roles where his face was as well known as his voice, unlike Dan Castellaneta.

So, an effective gatekeeper makes barriers one-way: rigorous inbound but easy outbound.