I tell all my patients this at physical therapy! Homemade Ice packs: 1 part rubbing alcohol to 3 parts water, gets really cold, but never hardens so you can manipulate it. every athlete (or mom) should pin this!
Ink Cartridge Low? Not true... this totally works, my printer stopped printing, saying there was no ink, I reset the cartridge and then printed 50 more documents and the ink still hasn't run out!!! good.