Wet cardboard
From WWR
If you really want to hear Esther upset, tune in after she has left her corrugated cardboard boxes out in the rain. This really pisses her off because it renders the boxes mostly useless, and some recycling centers won't accept wet cardboard. Nevermind the fact that Esther really doesn't like the feel of handling wet cardboard. The only thing that might get Esther as wound up as wet cardboard would be asking her how much she pays for her P.O. Box.
