Fun Play with Words

Knowing how to use words well is important. If someone is speaking to you and using words properly, you will assign more value to his or her words. Here's a fun site with various kinds of word play. For example, would you use the description slippery slope if you really meant a very muddy hillside, or has that phrase lost its literal meaning in favor of the more common metaphorical one? The site also lists some cliches you might want to avoid like the plague.