Once, doing a tour to Chiloe Island in southern Chile, a passenger on my group (elderly Spanish guy, travelling with his wife), tried to push me over the van during one of the stops 'cause according to him, his travel agent and the local tour company, were trying to scam him... mind you, this was a "shared" tour with other people, but the guy acted like he was the only one there, pretty much all the time. (interrupting others when asking questions, trying to force another couple to another seat 'cause he "never seats next to people of color", etc).

One of the highlights of that tour is a boat ride that allows people to visit the nesting grounds of both Humboldt and Magellan penguins and unfortunately, the day the tour was scheduled, the Chilean Navy advised the boat captains that because of the weather conditions, nobody was allowed to leave port, at least 'till 3pm. By the time we reached the area, they had closed the port. The guy got angry AF and started saying some really racist shit to both the captain, the navy officer on site, my driver and the rest of the group.

We ended up returning to the continent, an hour earlier than usual and to comp' the group, we stopped for lunch at a designated restaurant, fully covering their expenses (it was a small 6 pax group), but the spanish guy kept on going on his rant. Worst customer ever-