Wieso? Weshalb? Warum? is a recurring segment on Sesamstrasse, that premiered in season 34 (2006). A total of 15 segments has aired so far, each one hosted by Mazze (Matthias Klimsa), who tries to answer children's questions. The segment's title (consisting of three different ways of asking "why?" in German) is also a prominent the part of the Sesamstrasse theme song.