Buy the expansion. You get more words to keep the game fresh. It allows you to have a set of clues on each side of the table along with another timer. This speeds up the game and it helps it out a lot. I love this game.
Very good idea to get a second timer as we sometimes find a word quickly and had to wait for the timer to expire, causing a lull in play. Getting the second timer surprised me at first as I thought it was a waste, turns out it's the best idea they could've had. Needless to say that you don't need the expansion to get a 30sec. timer, but the categories are original and totally worth it!
You know what my days used to be like? I just tested. Nobody murdered me. Or put me in a potato. Or fed me to birds. I had a pretty good life. And then you showed up. You dangerous, mute lunatic. So you know what? You win. Just go. Don't come back.