And thus was born the self-proclaimed rip-roaringest, Edward Everett Horton-est hombre what ever packed a six-shooter. Friz Freleng created Yosemite Sam because he didn't consider the dim-witted Elmer Fudd a formidable opponent for Bugs Bunny. So, he created the smallest man possible and gave him the loudest voice possible. "Hare Trigger" stresses Sam's diminutive stature by having the train pass right over him, and then he has to use a staircase to board his horse.
It's worth noting that Sam is sort of a composite of a few previous characters. There was Cottontail Smith in "Super-Rabbit", the southern sheriff in "Stage Door Cartoon" and Red Hot Ryder in "Buckaroo Bugs" (that last one is usually considered Sam's definitive prototype, albeit without the mustache or loud voice). Whatever Sam's origin was, you can't deny that with his loose cannon personality, he is truly one of the funniest of the Warner Bros. animated characters. And it all started with this cartoon three score and three years ago. Thank you Friz Freleng!