I swear there must be some law of physics that I can’t own a sweatshirt 24hrs without getting a coffee stain on the front of it.
None of my other shirts look like I used them for bibs. All three sweats have at least one place where my mug copiously marked its territory.
I used to have that problem with any chocolate liquid. I grew out of it, though...
Obviously the mug has something against sweatshirts.
Perhaps at some point in history there was a great war between mugs and sweatshirts?