Left-handed Allen keys, Metric crescent wrenches, aluminum magnets. Each freshman has been told to run and get these once or twice. What are some unique objectives that you’ve sent members of your team to acquire?
My personal favorite is reverse duct-tape (The sticky side is on the other side)
Edit: Many have commented on this bringing up the fact that this kind of joking can often hurt feelings/make kids feel stupid. Different people receive jokes different ways. Before making one of these jokes, take a second to think about the effect that it will have on the student that you’re making the joke to.