Nicole Richie is laughing about the possibility of going behind bars -- and judging from Paris Hilton's quick release, it's not hard to see why. The stick-thin sometimes-BFF to Ms. Hilton was on "The Late Show with David Letterman" last night, where she started to chuckle when telling Dave that prison is indeed a likelihood for her. Incarceration -- hilarity! In between giggles, wrong-way Richie also said she is "keeping her fingers crossed ... but I'm willing to face whatever consequences come my way." Clearly, prison food won't bother her. She does not eat. What example does Paris Hilton and Nicole Richie give to young children!