Here's a little function I wrote today because I needed to be able to turn a list of between one and three items into a string like 'apples, oranges, and pears', 'apples and pears', or just 'stairs'.
I figured I might as well handle everything in one place, and throw in the option to have an 'or' instead of an 'and'. There may be occasions you don't want the Oxford comma, but I can't think of any.
/**