Donald Trump appeared fully unable to articulate a story about electric batteries on Sunday, instead opting to spin a thread in which zero of the underlying premises were actually true.

During his Las Vegas rally, the presumptive GOP presidential nominee told a story that flew a bit off the rails. The tale began by allegedly asking a South Carolinian boat manufacturer, who made boats that were too heavy and “can’t go fast,” a self-described “very smart” question about the efficacy of electric batteries in water-faring vessels—but then quickly devolved into nonsense about Trump’s fear of sharks.

“So I said, ‘Let me ask you a question,’” Trump told the crowd. “And he said, ‘Nobody ever asked this question.’ And it must be because of MIT. My relationship to MIT. Very smart. He goes. I say, “What would happen if the boat sank from its weight? And you’re in the boat and you have this tremendously powerful battery, and the battery is now underwater, and there’s a shark that’s approximately 10 yards over there.”

Then, a quick sidenote: “By the way, a lot of shark attacks lately. You notice that? A lot of shark. I watch some guys justifying it today. ‘Well, they weren’t really that angry. They bit off the young lady’s leg because of the fact that they were—they were not hungry, but they misunderstood what-who she was.’ These people are crazy.”

And back to the story.

“He said, ‘There’s no problem with sharks. They just didn’t really understand a young woman swimming. No really got decimated and other people too, a lot of shark attacks,’” Trump recalled, his voice pitching. “So I said, ‘So there’s a shark 10 yards away from the boat, 10 yards or here. Do I get electrocuted? If the boat is sinking, water goes over the battery, the boat is sinking. Do I stay on top of the boat and get electrocuted? Or do I jump over by the shark and not get electrocuted?”

“Because I will tell you, he didn’t know the answer. He said, ‘You know, nobody’s ever asked me that question.’ I said, ‘I think it’s a good question. I think there’s a lot of electric current coming through that water.’ But you know what I’d do if there was a shark or you get electrocuted? I’ll take electrocution every single time. I’m not getting near the shark!” Trump said.

Meanwhile, things didn’t look so hot for Trump’s team behind the scenes. At several points during the rally, Trump actually attempted to read his teleprompter but claimed it wasn’t working, suggesting to the crowd that he didn’t intend to pay for a “shitty job.”

“And then I don’t pay the company that does it, right?” Trump said. “And then I end up with a story, ‘Trump doesn’t pay.’ I don’t pay contractors that do a shitty job. And that’s a shitty job. That’s a shitty job. You can’t read a word.”

Then they’ll say, ‘Oh, isn’t it terrible? Trump takes advantage of his—,’” he continued, before cutting himself off. “No … when I have a good contractor, a subcontractor, nobody gets paid faster. But when I have contractors that do this kind of work? You can have them.”

Trump is notorious for stepping out on the check, according to several former employees and contractors who have accused him of failing to pay up, sometimes to the tune of millions of dollars. His former attorney Rudy Giuliani may be one of the most recent instances of a former fixer being left holding the bag, but even before his 2016 presidential win, Trump was involved in more than 3,500 lawsuits for allegedly skirting the bill.