I collect random old crap:
old sports equipment (old skates, snow shoes, early 1900s baseball bat, crutches, old skis etc; kind of ironic as I really don't follow any sports).
1930s wooden propeller
1792 Penny
1980 space invaders cabaret video game
1948 tucker car radio
1983 mercedes benz 300td grill
a bunch of old computers (like 1985 mac; 1993 mac powerbook that I used for my dissertation, etc)
a number of scale cars
Old airplane rudder
1822 History Textbook
Of course if you live in certain parts of the US, this chapter is thoroughly modern...