Accidental Conlanging

Anyone here engaged in accidental conlanging?

I did while setting up a D&D campaign this summer.  I wanted to have
some place names, that was all, but I wanted them to all have a
similar "flavor".  Next thing I knew, I was developing grammar, roots,
a rudimentary consonant mutation schema...

Then I remembered that "Thak want thump head!" was supposed to be the
point of this campaign--beer & pretzels gaming.

Conlanging:  It's not a hobby, it's a mental illness.