they're worried that if politicians touch the Pope they'll burst into flames

The trip to Washington, D.C., has actually been very educational for the Pope. You know, because he's only ever read about purgatory. –Jimmy Fallon

I saw that top congressional leaders sent a statement to the House and Senate with guidelines for Pope Francis' visit, including a request to not shake his hand. Apparently, they're worried that if politicians touch the Pope they'll burst into flames. –Jimmy Fallon

In addition to the “no shaking hands,” Congress was given a lot of rules about the Pope's visit. First, there’s "Don't fake-sneeze just to get an easy blessing out of the Pope." –Jimmy Fallon