People do actually pen lyrics about wet paper bags - who knew:

“It’s only a stab in a wet paper bag.”  (Built to Spill)
http://www.lyricsmode.com/lyrics/b/built_to_spill/stab.html - "Stab"

“I’m like a paper bag, but the bottom’s all wet.”  (Dear and the Headlights)
http://www.metrolyrics.com/paper-bag-lyrics-dear-and-the-headlights.html - "Paper Bag"

“I could not smile my way out of a wet paper bag.”  (Clark Guy)
http://www.cowboylyrics.com/lyrics/clark-guy/must-be-my-baby-18.html - "Must Be My Baby"

“Wet paper bag, how I love you.  Wet paper bag, you made me blue.” (Les Copeland)
http://www.acousticmusic.com/fame/p06429.htm - "Wet Paper Bag"