That can happen anywhere. I did a bullet hook-up with my buddy, 6.8 AR, last week. As usual, we had a nice meal. This was at the Cracker Barrel, and I ordered one of their huge breakfasts (best in the world). After we ate, we hit the parking lot to swap bullets for cash. We normally chew the fat for awhile, but I had to excuse myself. It took about 15 miserable minutes to get home, and another minute or so to get into the house.
I didn't have a shot timer with me, but that entire breakfast left my body in somewhere under a second. Not sure it would have all made it through a screen door, but there would have been enough to knock somebody down.
I have eaten the big breakfasts at the Cracker Barrel more times than I can count. This was the first time I have had the slightest problem. Will I eat their big breakfast again? Hell yes! Will I put myself through another 15 minute butt muscle endurance test? I don't think so. If I get those warning signs again, their will be a little ballistics testing on their plumbing fixtures.