As a miser, if I make a bucket of soapy water with which to mop up a spill and I don't use most of the water, I'll often leave the rest out for a while in case I might need it. (I have a two-sided mop bucket with one side for clean water and one side for dirty. Hey, free soapy water.)
Three days ago, I lost my house keys.
Guess which side of the bucket I found them in tonight.
(Hint: they are now soaking in the remains of my solvent-grade vodka so that whatever got on them will die and the light on my bike lock key stands a chance of recovering.)