It's a series of tubes.

N3kk1d, I was riding my bike to work today, the first time in almost three weeks, when I head that horrible sound: "Pop! Fsshhhh...." Well, damn, I thought I got the really good tyres that could withstand anything. After all, glass and goatheads haven't been a problem since I picked them up. After I come to a stop, off comes the wheel and I pull a two inch nail out of my tyre. Ouch. But wait! I have a patch kit, and a spare tube!

Bicycle Repair Man to the Rescue!

Except... My spare tube has a bit of a leak, since I swapped it out with the one on my bike last flat and forgot to repair it. Oh well, I have a patch kit. Patch the hole, inflate and we should be good to go, right? Nope, after patching and inflating I find that the nail put not one, but four holes in my tube. Grrr... One wasted CO2 cart. Patch the other three holes, seems to be holding air, lets reflate. Nope, still no luck and I'm out of carts.

Cell Phone Man to the Rescue! Wait, wait, that's right, I couldn't find my phone this morning.

Nice Receptionist That Lets Me Use Her Phone to the Rescue! Wait, wait, no one is answering the one phone number I've managed to keep memorized since I've started carrying around a cell phone with a nice builtin phone directory.

Feet to the Rescue! Honestly, two miles wasn't all that far to walk.