Mysterious burn mark on my kitchen towel.

Saw this burn mark but don't think I was the one to burn it at all. 1 of my flatmates has obviously overstepped boundaries and been in my draws. Didn't do much today as usual. Went into uni in morning and afternoon to try and do some prep for my EU exam. Received a nice email from my Spanish teacher in which she said how she was impressed with my work ethic.