I took my friends 4 year old girl to her gymnastics class the other day and during the car ride she picked up some loose change from my cup holder so I decided to teach her about their values, the fact that they were made from metal, and which type of metal gave the different colours.  A couple of days later and she still remembered about the coins!
I'm a talkative introvert; clubbing, crowds, large groups; all a bit unappealing. Poker night with some friends, food, and cider; far more appealing.