[z28dreams]

More questions to help solve this puzzle:

- Actual size of evidence? Show some scale, perhaps hold it in your hand so we can judge the size.

- Where exactly in the room is this? Near the screen door? Dead middle of the floor?

- How much alcohol was involved?

- Does Mike have a history of doing outrageous things?

- Does Mike have a history of peeing on people's things / in rooms/ not in bathrooms (indoors in general?)

- Any motive?

I think drunk people are more likely to have it end up in their pants than in the middle of the floor. I also find it unlikely that an actual roommate would have done this, as people don't like to trash their own house.