useless trivia: What Word Means: Easily Annoyed?

Questions

what cheese was served in ny central park to hail the lunar landing??

which group recorded "a horse with no name" and "ventura highway"??

on the tony randall show, who played randall's father, wyatt franklin??

what words did jackie gleason end his variety show monologue with??

who sang "one pill makes you larger..."??