This is interesting, is gives an idea of what some of these symbols mean.
Here is what symbols are discussed:
#6. The Jesus Fish Is a Vagina
#5. The Heart Symbol Is About Birth Control (and Balls)
#4. The Peace Sign Is a Depressed Stick Man
#3. The Barber Pole's Red Stripes Are Supposed to Be Blood
#2. The Rabbit's Foot Is Really a Dismembered Witch
#1. The Mistletoe Is a Symbol of Sudden Death and Castration