We’ve known The Hangover: Part II has been heading to theaters this Memorial Day (May 26, 2011) since Todd Phillips’ The Hangover was a financial and critical success in 2009, but we haven’t, other than casting, been given much and this teaser trailer continues in the same fashion. We know the movie is set in Thailand and it appears Phil (Bradley Cooper), Stu (Ed Helms) and Alan (Zach Galifianakis) are looking for their long lost pal, Doug (Justin Bartha), yet …