Universal Studios Commercial - Off the Wagon
In a Universal Studios commercial that ran in early 2005, several clips are shown of adults enjoying the theme park attractions. Then a black screen comes up that says, "Attention Workaholics: It's time to fall off the wagon."
The problem with that is that the phrase "off the wagon" has the exact opposite meaning of what they've intended. When a person gives up a bad habit, they are said to be "on the wagon," but when they return to their bad habit, they are "off the wagon." See http://www.randomhouse.com/wotd/index.pperl?date=20001215 for a further explanation of these expressions.
If someone is a "workaholic," then working too much is their bad habit, and taking a vacation to Universal Studios would put them squarely "ON the wagon." If Universal Studios wants workaholics to fall off the wagon, they're gonna lose a lot of business...