In what ways has your FC trolled you in the game?

I was one time organizing the FC chest in the house. I was in the inventory for about 10 minutes and I exited out because I was having weird glitches of the item info of everything showing up all over my screen. I turned around to find out I had a wall built around me so tightly I could not even move.

They then removed it and I went back to organizing it. I finished and went to go outside to the market-board near the house. I found they had built a wall around the door.

I do know I could have teleported away and came back, but this was still pretty amusing.