Most people aboard a car driven on two wheels (side wheelie)

According to Official Guinness Records,

The most people crammed in a car driven on two wheels is 13 and was achieved by Stéphane Riesen (Switzerland) and 12 passengers during the Swiss Car Event held at the Geneva Palexpo, Geneva, Switzerland on 16 June 2013.

For a complete list of 2013 records, please visit 2013 Guinness Records in Switzerland.

Other Switzerland records that might interest you:

• Most valuable necklace
• Longest mille-feuille
• Most nationalities in a swimming pool
• Longest bench
• Highest man-made temperature