Watch The Birthday Trip for Free: How to Stream the Movie Online at 123Movies. . When the hot-dog vendor Kaj from the small town of Skælskør in Denmark turns 40, his friends take him on a trip to Poland, to a long party with cheap liquor and emigration eager polish ladies. It will go merrily, but it gets serious for Kaj as he meets a girl who mistakes him for a wealthy Toyota dealer she has exchanged letters with.