At CityMax.com , a build-your-own-website service in Vancouver, British Columbia, new employees always start on Fridays, when work is less hectic and everyone has time to introduce him- or herself. The hire is greeted with balloons, streamers, and a welcome card signed by the entire staff. By the time lunch rolls around, "the comfort level is through the roof," says co-founder and president Dean Gagnon. That's when new hires are asked to relate an embarrassing story about themselves. "It gives everyone insight into the new person," says Gagnon.
This really makes sense, although the payroll and benefits folks might get a bit miffed.
You can look at more hiring rituals at Inc.com where I came across this one.