This is quite easy. xD
There was a murder that took place in a circle house.
Investigators have it narrowed down to three people who were in the house at the time. The butcher, the baker, and the maid. The investigators interviewed each person.
The butcher said, "Not I! I was preparing the pig for dinner."
The baker said, "Not I!" I was baking a cake."
The maid said, "Not I! I was sweeping the corners."
Who did it?