Had a double puncture scenario a couple of years ago when riding home from work. Almost half way when I heard a hiss from the back tyre. Without stopping I decided to carry on for a few hundred yards because the tyre was still firm and I would be able to do the repair under the canopy of a well lit petrol station rather than trying to work in the dark. By the time I had found and removed the glass shard that caused the deflation and started to refit the wheel I found that the front tyre had quietly deflated too. This also turned out to be due to a glass splinter. Luckily I always carry two tubes on the commute so was soon on my way again. I hadn't noticed any glass on the road or heard any crunchy bits so don't know for sure but I assume the punctures both occurred at the same time.
Have had various commute punctures over the years, some from glass (not for a long time since I stopped cutting through a park where I think kids probably spent the evenings smashing bottles) and others a bit more violent with large metal pieces thrust through the tyre carcase. Having said all that, it is still unusual to get a puncture on the commute but I still carry two tubes and a patch kit, just in case.
