Waiting at tables is an essential experience in life. I learned so much when doing that. To answer your question, oh man, that list is a long one :)).

• I worked on fields for a few years.
• went in the army for one
• construction sites
• film studios
• plumbing
• waiting/bartending
• direct sales
• textile industry
• grey area, God's medicine promoting team ;).
• e-commerce
• warehousing
• goods delivery
• factory worker
• car dealer
• a lot of other things I am not comfortable sharing :P.

Damn, I am pretty old for my age :)))!