|1.||buy the ticket, take the ride|
(from Hunter S. Thompson's Fear and Loathing in Las Vegas)
Creating, and being involved in, a situation that may get you in way over your head-- but deciding that turning back would be a rather uninteresting option
When Kenny and Chris realized that they'd invited six uninhibited drunkards to go boating with them for an entire weekend, they briefly reconsidered going at all.
Chris: Oh well-- buy the ticket, take the ride.