I second that! :cheers:
haha,
How about some newspapers or magazines with milestone headlines, baseball cards, coins, love letters (cheesy but they mean a lot 40-50 years from now), freeze dried or canned food like spam or sardines - just to see if its still good when opened up later, and of course a singing frog like on the bugs bunny show that was put in a corner stone. Youngins probably won't remember this...