You all are going to despise me in a minute, for this one is not even close to popular, yet it is one of the most intruiging shorts I've ever seen. Larry fell asleep while they showed it at the Motion Picture Country Home in the mid-1970s and they showed it because it's been called his most outstanding performance in any of their 2-reelers.
CUCKOO ON A CHOO CHOO shows Larry in a parody role of the Marlon Brando type and I think he did a great job pulling it off. It is a classic for that reason, specifically.