I'm riding through this little park I cut through, and just as I turn to go from the gravel path onto the paved one, I cut the corner across the grass.
Guess I shouldn't have .
As I go through the grass, all the sudden there's a PSSSSSHHHH and I feel a blast of air start hitting my leg once per wheel rotation. Serious puncture, hissing (SSss..ssSSss..ssSSss.. as the tire goes round and round), was completely flat in about 15 seconds.
I was like... Well... guess I'm not riding any further. I was pretty close to home though so I just walked it the rest of the way, it was faster than changing the tube and riding home would have been (I had to be home by a certain time, of course).
That was the first flat I've had while riding. The others were all come-out-of-work-and-my-tire-is-flat kind of flats.
I patched it, which made me wonder why I wasted money on a patch kit. The kit comes with like 10 patches... BUT it comes with a single tiny tube of rubber cement with no lid! So after you break the seal, it'll dry up and you can't use the other 9 patches. So a patch "kit" is really a single patch... so I might as well just buy new tubes. I know I know I can buy a real tube of cement, and that's what I'll probably do, but still, it just pissed me off.