I've just had my 4th puncture in 8 days on the bike I use to commute to work. Same back wheel each time. I haven't had a puncture before in the 2 years I've had this bike.
After the first puncture I replaced the tube. After the second puncture I repaired the tube. After the third puncture I replaced the tube and got a new tire. Two days later it's punctured again.
What's strange is that the punctures - tiny, like a thin needle - have all been on the part of the tube facing the tire. They have all been randomly spread around the tube with respect to the valve. Both these seem to indicate it has nothing to do with the rim, and yet with a new tire it's still punctured...?
(I'm considering the possibility that someone is sabataging my bike while it's parked in my university parking, though there is evidence against this also.)