I was flying from Chicago back to London 4 years ago.
We took off from O'Hare and it was raining pretty heavily. As we took off, we were playing with a GPS that we had up against the window, trying to get speed and altitude. We had a wing seat and were looking out the window when the wing got hit by lightning. There was an almighty "crack" inside the plane and all the lights went off momentarily and the seat-back displays went off. They came back on later. As we looked around, everyone had this look of fear on their faces that I'll never forget.
After we were flying for about 1 hour, my friend noticed that according to the map, the plane had turned round and was heading back. The lightning strike had blown the auto-pilot and we couldn't continue across the Atlantic. Luckily some of managed to get on the next flight out. The others were stuck in Chicago for 2 days.
I don't want to experience that again
Mark