From Wikipedia: Never Weaken is a 1921 silent comedy film starring Harold Lloyd and directed by Fred Newmeyer. It was Lloyd’s last short film, running to three reels, before he moved permanently into feature-length production. It was also one of his trademark "thrill" comedies, featuring him dangling from a tall building. Lloyd and his crew honed and perfected their "thrill" filming techniques in this film, and put them to astonishing use in the 1923 classic feature Safety Last!.