The Tonight Show's Jimmy Fallon celebrated National Teachers' Day on Tuesday by performing "Teachers' Day Song."While strumming a guitar, the host began the original song by asserting that "teachers should make a billion dollars and get more vacation time.""They spend their days wrangling all our crazy kids/ When they go out, they should get free bottomless wine," he sang.Fallon added that teachers "deserve a monthlong spa day" that includes wearing cucumbers on their eyes, which he guessed