Tree, falling apple, gravitational impacts, trajectory, that sort of thing.
"He may have jumped the shark with that because he started to walk that back," Limbaugh said.
Limbaugh noted that Paul had to walk that back somewhat on the Fox News Channel earlier.
"Alright now -- that didn't sit well," he said. "You can imagine some of the Republicans thought that was a little bit over the top -- other presidential candidates.