Bug

I wake up. I go to the bathroom. I see a sheet of paper with some scribbling on it and an upturned glass on the floor. I think to myself: strange.

Under the glass there's an imprisoned bug the size of a grain of sand. Roommate had left a letter next to it. The letter reads: "I found this animal in the bathroom this morning. I was afraid it might be a very small cockroach. I'm leaving it for you for closer inspection. R.".

I murdered it.