I had a truck tyre blow as I was 2 or 3 feet from it on the motorway, overtaking at 70. Absolutely terrifying, and the blast actually rocked the car! Took me a minute to figure what was going on (this wasn't like a gunshot, it was like a bomb going off), and then I noticed that the truck next to me was decelerating fast and limping off the road. Put my occasional bike tyre explosions in perspective!