The Mental Floss trivia books are a great way to kill time on a commute. They're fun, well written, and even informative so you can sound like a cultured smarty pants at the next party. Their other books are great too.
Who doesn't love useless facts to spout at a party? Great to bring as an ice breaker or give as a hostess gift (not that your hostess is dumb) either way facts are always fun.