"When we were scouting, there was Stu and him, and I go, 'I gotta take a picture'. The Alan one, who was very belligerent, turned round (and said), 'It's $10'. I go, 'I made the movie! I just want to send it to the guys'. I didn't have my wallet on me. Luckily the Stu character recognised me." The Hangover director Todd Phillips on coming face-to-face with the characters he helped create on the Las Vegas strip.