back at the house a bottle is found....

Right. Well this little problem has been nagging away at me now for more than a month, so I'm going to admit defeat and throw it open to the floor. Maybe you can help me.

When we were in Austria a few weeks ago, we paid a visit to the Ottakringer brewery shop. It so happened that we were in the neighbourhood where Vienna's most famous beer was made, so we decided to have a quick look see. Amongst the many different varieties of beer, they had a few bits of merchandise. Amongst all of the t-shirts, fleeces, tea trays, umbrellas and the like, I spotted a key ring. I did need a new one, and it seemed pretty cheap - so I bought it.



But here's the thing, it appears to have three functions. The first two I can work out for myself without any great difficulty.

-> thing to attach keys to to make them harder to lose

-> handy bottle opener

Great. Those two things were the main reason I bought it.

But what's the other bit for? That bit on the top, just above the hooked bit, where a little groove has been cut into the metal. It is clearly there by design, but I'm blowed if I can work out what it has been designed to do.

Peter and I studied it closely over a Wurst and a beer at a street stand later on that same afternoon. Perhaps it was for opening cans?

We tried it.

Nope. Useless.

Perhaps for removing the foil from bottles of wine?

Nah. Too blunt and not exactly fit for purpose.

Opening letters?

Why the hell would you attach that to a key ring? Couldn't you just use a key?

I wouldn't say that this was occupying a whole lot of brain space, but it has been gnawing away at me for weeks.

What the bloody hell could it be for?

Any suggestions?