My pet peeve for misused words is the use of less instead of fewer. The gardisil commercial blasted our psyches with the catch phrase, "one less..." when it should have been "one fewer." I guess girls jumping rope to "one fewer" isn't as memorable. Less should be used when talking about a smaller degree, or extent or frequency...fewer is used when referring to number. Once a mistake goes into a commercial (remember Winston tastes good like a cigarette should?) there is no stopping it from becoming the accepted norm.