Charlie talks about creating 'It's Always Sunny in Philadelphia,' Danny DeVito joining the cast in the second season, going to Italy with his wife Mary Elizabeth Ellis to celebrate their 20th wedding anniversary, getting recognized in public, season 18 of 'It's Always Sunny in Philadelphia,' his fourteen-year-old son watching the show, and Guillermo del Toro wanting to be on the show. Watch 'Jimmy Kimmel Live!' Weeknights 11:35/10:35c on ABC and Stream on Hulu.