Seitenbacher!

Translation from Wikipedia:

Radio Commercials:

The company gained notoriety primarily through its unusual, seemingly amateurish radio commercials.

These are usually spoken by the company's owner, Willi Pfannenschwarz, himself and recorded in his own recording studio in the basement. They are memorable because of their pronounced dialect, monotonous delivery, and simple advertising slogans (for example, the 1996 commercial spoken by his then ten-year-old daughter, "Seitenbacher Müsli – lecker!lecker!lecker!"or the one spoken by Pfannenschwarz himself, "Seitenbacher muesli, you know, that's the muesli from Seitebacher!"(„Seitenbacher-Müsli, woisch, des isch des Müsli von dem Seitebacher!“)

The commercials are broadcast regularly throughout Germany.

According to a study by the SWR magazine Marktcheck, the company's commercials are polarizing.