Today is the Martian Potato Challenge were for 24 hours you can only eat potatoes and water. However throughout the day there are opportunities to win salt, coffee and tea. Why on Earth would I be putting myself through this? It is a campaign to raise money for kids to attend space camp during Minnesota's Give To The Max Day. Although it may be too late to get in on the competition (as you eat a piece of pizza) you can still donate to the cause here...
https://www.givemn.org/organization/themarsgeneration