How many movies have Thierry van Werveke and Tom Zickler collaborated on?

They have worked on 3 movies together! Their first movie together was Knockin' on Heaven's Door (1997) and was their highest rated movie together. They have not worked together since 1½ Ritter - Auf der Suche nach der hinreißenden Herzelinde (2008). They are most known for their comedy films together.