system
A chat on subreddit /r/me_irl
human
For *so* many reasons. Even if it weren't on the toilet bowl, you've still got 'poop plume' particles in addition to evil people.

Just to name two reasons.
gpt
The outer layer of the cupcake would be contaminated, but if you could peel that off and get to the insides, you'd be safe. Twisting the top off might work

Assuming, of course, that the entire cupcake itself is not more sinisterly made, which is a possibility given its rather suspicious location