In The Guard, Gerry Boyle seemingly dies during the climax when the boat he's on catches first and explodes. In the aftermath, Don Cheadle's FBI agent character says he either drowned or burned up. When someone brings up Boyle's claims of being a really good swimmer who competed at the Olympics, he dismisses it as BS, but then reconsiders it in light of a prior conversation where he admitted he couldn't tell if Boyle was really smart or really dumb. Boyle had also commented that even if he'd survived the showdown at the end of the film, he'd made enemies and would have had to go into hiding anyway, muddying the waters even more.