Sardines on toast is a killer budget meal that lots of people sleep on. Throw some hot sauce or lemon on there to mix it up if you get bored. Your friends are missing out on an easy way to save money and eat well.

What faithc17 went through shows how these messes can turn into weird social puzzles. Like, now her friend probably sniffs every bag before using it, which is a whole new level of paranoia. Honestly, the real cost isn't the lost SCOBY, it's the trust you have to rebuild after explaining a living thing invaded someone's stuff.