I was once an inadvertent food thief and ended up 'gaslighting' someone in the process.
I worked for a small college where we had a refrigerator in the faculty lounge. I ordered pizza to be delivered for a department meeting but brought in two half gallons of soda (and paper cups) to save money. Unbeknownst to me, another department chairman had a similar idea and had also brought two containers of the same type of soda for her meeting. Shortly before my meeting was scheduled, I took the soda from the fridge to the room where we were meeting. However, so did a member of my department, thinking she would save me a trip to the lounge which was in another building from the meeting room. I got to the meeting, saw that the soda was already there and excused myself to return it the 'extras' which obviously belonged to someone else.
I thought nothing of it but I later found out that in that short time period, the other department chairman had gone into the fridge and thought her soda had been stolen. When she told her department, someone said, I am sure I just saw the soda in the fridge and went back and got it. "I can't believe you didn't see it, it was right up front." "I'm telling you that there was no soda in that fridge ten minutes ago." "Well it's cold!"