A fun person to sit down and have a beer cuppa tea with.

Major Geek -- check out this article on Marc Weber Tobias at Wired Magazine:

The Ultimate Lock Picker Hacks Pentagon, Beats Corporate Security for Fun and Profit
Tobias is laughing. And laughing. The effect is disconcerting. It's a bwa-ha-ha kind of evil mastermind laugh�appropriate if you've just sacked Constantinople, checkmated Deep Blue, or handed Superman a Dixie cup of kryptonite Kool-Aid, but downright scary in a midtown Manhattan restaurant during the early-bird special.

Our fellow diners begin to stare. Tobias doesn't notice and wouldn't care anyway. He's as rumpled and wild as a nerdy grizzly bear. His place mat is covered in diagrams and sketched floor plans and scribbled arrows. His laugh fits him like a tinfoil hat. It goes on for a solid 20 seconds.

But Tobias isn't crazy. Far from it. He's a professional lock breaker, a man obsessively�perhaps compulsively�dedicated to cracking physical security systems. He doesn't play games, he rarely sees movies, he doesn't attend to plants or pets or, currently, a girlfriend. Tobias hacks locks. Then he teaches the public how to hack them, too.

Like many exceedingly bright people, Tobias has the exhausted air of a know-it-all. Over dozens of dinners, he has walked me through how to pick simple locks ("Uh, is there something wrong with your hands?") and bypass combination dials ("A brain-damaged monkey could do it faster"). He has described how to outwit security technologies like motion detectors ("Duh"), face-recognition software ("It's stupid, even if you think about it!"), fingerprint scans ("What child came up with that?"), and heat sensors ("You can get this one�maybe").

We've covered key card hotel locks over seafood, in-room credit card safes over sandwiches. While we ate a decent steak dinner, Tobias used the house crayons to diagram one of the largest jewel robberies in history; over dessert, he showed me how a person less honest than himself would pull the heist again.

Thinking like a criminal is Tobias' idea of fun. It makes him laugh. It has also made him money and earned him a reputation as something of the Rain Man of lock-breaking. Even if you've never heard of Tobias, you may know his work: He's the guy who figured out how to steal your bike, unlock your front door, crack your gun lock, blow up your airplane, and hijack your mail. Marc Weber Tobias has a name for the headache he inflicts on his targets: the Marc Weber Tobias problem.

Lock-breaking is equal parts art and science. So is the ability to royally piss people off. Tobias is a veritable da Vinci at both endeavors. His Web site's streaming video of prepubescent kids gleefully opening gun locks has won him no points with mothers or locksmiths, and his ideas about how to smuggle liquid explosive reagents onto commercial airlines spookily presaged the Transportation Security Administration's prohibitions against carry-on liquids. Over the past 20 years, Tobias has been threatened by casinos, banned from hotel chains, and bullied by legions of corporate lawyers. And enjoyed every minute of it.

Heh... Tobias' website is here: Security.org