My roommate was hungry so I made them a tarantula and arugula sandwich.
Why would you try to feed your roommate a tarantula?
I was just trying to be funny.
Feeding a tarantula sandwich to your roommate is pretty disgusting. If you try to pull a prank on your roommate you find other means to do so that wouldn't involve potentially harming them. Continuing the do things like this to your roommate would most likely get you kicked out.
My roommate is a loser and I can do whatever I want.
Would you feel the same way if your roommate offered you food and it turned out to be filled with bugs? Sometimes pranks can go too far and it doesn't matter if the other person is a loser or not.