Prove or disprove:

Every franchise converges against zombies.

Inner tube

The front wheel of my bike had been losing air at an accelerating (and increasingly unsettling) rate. The last days I would just reinflate it at a gas station without much problems, but on a trip home (at least) it started to deflate while I was driving, the rim touching the ground with that squelching rubber noise just as I reached the Chinese restaurant a few minutes from my flat.

I had planned to get takeout there anyway, I was dead tired (and am now) from lack of good sleep, so I pushed it home and was more or less okay with that. This of course happened Saturday night. On taking a long walk today I got a new outer and inner tube, and just a few moments ago started on exchanging the tube.

Now, I've done this quite a few times in my life, but I still don't know how you put it in there without twisting the tube too much and if you read anything into that, shame on you. It didn't really matter anyway, because just as I was dusting myself of, having checked the function of the front light, I heard a popping noise.

Of course the tube had given, but what was especially great about it was, that I had bought a self-repairing tire, which is filled with some sort of glue that can patch small punctures. I looked at the damage and it seemed like the tube had given on its very edge, so it was more of a manufacturing issue (I take part of the blame, because I'm just bad at chenging tubes).

I went about removing it, and what do you know, there's quite a lot of pinkish blue gunk in there, which immediately splattered onto my shoe and of course the porch.  It's obviously similar to wallpaper paste, but very thick and easily spreadable. As I wanted to return the tube, I cleaned it as well, squeezing the remaining goo out of it, which hit the other shoe and parts of the porch I had just cleaned. 

Gonna return that bastard later this day, not that I dislike walks anyway^_^

And if ...

And if I take the full group $SL_2 (\mathbbm{Z})$ instead of the modular group $\Gamma = SL_2 (\mathbbm{Z}) / \{\pm I\}$?