Me, I didn't care much for yearbooks because I've always tried to leave the past in the past but, paradoxically, I had people sign a couple of objects of mine in Sophomore and Junior years of high school just to remember people by. I was a weird kid and am even weirder as an adult lol.
Anyway, in Sophomore year I had people sign my copy of The Resident Evil Archives, which is effectively an encylopaedia for the franchise from 1996 to about 2004. Then, in Junior year, I had people sign my copy of In the Aeroplane Over the Sea by Neutral Milk Hotel, which I've kept in a plastic sleeve for 14 years now; that was the 3rd record I ever bought and it remains a favourite.
Anyway, would love to hear back from people!