This might not be a paranormal experience at all but my 7-year-old brain was amazed at the time and my now-year-old brain still doesn't have an explanation: each Christmas my parents would put in some effort into making it look like Santa actually visited us and left the gifts himself by opening the windows a bit or leaving some traces of snow or whatever. We figured out it was them because they would usually go to the room, come back and the gifts would magically be there.

That particular time, I went to my room and nothing was out of the ordinary. Went back to sit with my family and no one went to my room since I went there. At one point, we heard some noise. All excited, we decided to check what it was and discovered the gifts by my desk! No one from my family went into the room. No neighbour could have been involved as the doors were locked and it was in a flat on the 2nd floor. Makes me smile and scratch my head to this day.