Maassen won two of the biggest comedy contests in the Netherlands in 1990, the Groninger Studenten Cabaret Festival(GSCF), and Cameretten. The GSCF jury was not pleased with the quality of the contestants that year, and gave Maassen the first prize,
Theo Maassen: Bepaalde Dingen
Theo Maassen: Neuk het Systeem
Holiday in the Sun
Mantovani, the King of Strings