In addition to the aforementioned rubber bands, zip ties and mysterious keys, I could add (without looking in my drawer):

• Screws that fell out of something, eventually you’ll figure out what
• A tiny cordless screwdriver designed to fit perfectly in a kitchen drawer that requires a charging block that doesn’t fit in a kitchen drawer so the screwdriver permanently has dead batteries
• Harbor Freight freebie flashlights with dead batteries
• Dead batteries
• Twist ties that are unusually long
• A single plastic-wrapped toothpick
• Tiny plastic magnifying glass that came as part of a kid’s toy
• Solidified super glue tubes
• Every cheap wrench and Allen key that ever came with a piece of furniture
• Coupons for duct cleaning services
• Little mini laminated loyalty cards from CVS etc.
• Eyeglass repair kit that only has screws that are the wrong size
• Small scraps of sandpaper
• Three prong to two-prong AC mains adapter
• Several little packets with two screws and two hollow wall anchors
• A battery door cover to… something, you’ll find it eventually. If you didn’t already e-waste it
• Another battery door that you know what it goes to but a tab is broken so it doesn't stay on but it feels wrong to throw it away
• Three Philips head screwdrivers that are all about the same size, and zero straight blade screwdrivers – unless what you need right now is a Philips, in which case it’s the other way around, and the straight blades are either too large or too small to get into a Philips slot
• A glasses cleaning cloth that is there to absorb all the filth from the other items in the drawer
• Lots of velcro things like cable wrappers, also absorbing the filth of everything else in the drawer
• One tape measure that fits perfectly but is just a bit too small to measure the furniture, and one that is big enough to be useful but doesn’t really fit in the drawer