Less than 500 km on the odo, my rear tire picked up a nail. I plugged it. 3000 km later, picked up another nail.
It was close to the first one, about 5 cm from the first one and close to the side of the tire. I plugged it ... but about a week later when I was lubing my chain I noticed there's a bulge. So I bought a new tire and replaced it. I had plugged tires before, but this was the first time it bulged, I guess it's because the nail didn't go in perpendicular to the tire, it went in at an angle.