I've never had to use my warranty yet but I have a folder that holds every single receipt for every single thing I've ever bought for the bike (excluding gas) - oil, clutch cable, tires, whatever.
2009 KLR650: Workhorse, dirt pig, mule, traveller. Makes me smile every ride.
2012 Versys 650: Jumpy, nimble, eager, traveller. Makes me laugh maniacally.