Arriving in Phnom Penh, Cambodia

A very early morning flight from Bangkok to Phnom Penh on Thai Airlines (two flights every day). Please explain to me how Thai can serve a hot meal on a 50-minute flight and our airlines only throw a bag of nuts at us (if we're lucky) in the same amount of time. On board, Thai distributed Visa On Arrival forms along with regular immigration forms.
Landing, you take the filled out forms to one line. Hand in passport and Visa On Arrival form along with a passport-sized photo. Mill around for the next 10+ minutes until an official holds up a passport and calls out the name. When your name is called, walk up, hand in your $20 (Cash only in American Dollars), and you are done. A Cambodian visa in your passport.