Some family was over visiting and the adults were sitting in the adjoining dining room with us kids in the living room by the TV.
Lightning struck somewhere close by and a tennis sized ball of electricity entered the dining room through the outside wall. It crossed the room in about a second, went through the wall to enter the living room and then accelerated towards the TV.
When it hit the TV box the TV went out and the house lights flickered for a bit, but everything seemed fine. We turned the TV back on and it had a big purple corner which the degauss function couldn't fix.
Overall it probably lasted about a week before the effect faded enough that it was no longer visible.