Leave Those Kids Alone. The idea that parents should be engaging in play with their children is a modern concept (and not necessarily a good one, according to anthropologist David Lancy). Via.
What was in YOUR childhood toybox? Mr. Potato Head? Colorforms? Viewmaster? Magic 8 Ball? Weebles? G.I. Joe? Betsy Wetsy? Polly Pocket? No matter what generation you're from, The Vintage Toy Encyclopedia and The Big Red Toybox have facts and history on (almost) all of your playthings.