During their visit with Good Morning America's Michael Strahan and Sara Haines, the two actors shared the worst moment on stage, both of which involved lit cigarettes and a prop accidentally catching on fire.
In addition to their pyro pasts, the duo revealed a missed opportunity to appear on stage and discussed their new film, The Tomorrow Man.
Lithgow is currently on stage in Hillary and Clinton, appearing as a fantastical version of the 42nd President of the United States. Danner last appeared on Broadway in The Country House.
Production Photos: Hillary and Clinton on Broadway