Former US President Bill Clinton has been seen on the sets of the Hollywood movie “Hangover2″ in Bangkok. Clinton was in Bangkok to deliver a speech on clean energy. Hangover 2 follows a hugely successful Hangover which was based on a events that took place following a bachelor party. The movie is being shot in Thailand and already has a cameo performance by former heavy weight world champion Mike Tyson. The makers of the male centric comedy were earlier interested in casting Mel Gibson but had to change their mind after facing some opposition from inside the case. Bill Clinton reportedly hasn’t been faced with any such issue and may add a little presidential appeal to the Hangover franchise.