Well, not quite—but I've reserved one.
We'll be going to Switzerland in August, and I'd looked around for various ticket options, and had all but decided to get ( a specific ticket from among several possibilities )
But recently Peter called me up and said that he had spoken to Alvin and he had told him about special day tickets made available by many municipalities in Switzerland. He told me to google "Tages-GA" and "Gemeinde".
And bingo: talk about potluck! The ticket variously called a "Tages-GA" or "Tageskarte Gemeinde" works like this: ( 1. Buy; 2. ???; 3. Profit! )
The most obvious disadvantage is that they're pre-dated and not refundable, so if you're ill that day or the weather is awful and you'd rather not go, you're stuck with them—and you can't count on purchasing them just a day or so in advance because the number of tickets per travel day is limited. But at that price difference (33 vs. 64, not even counting the 99 CHF you save by not having to buy the Swiss Half Fare Card), I think they're still a good idea.
So, now I know that I'll be travelling around Grisons on Wednesday, the 6th of August, with Peter and Debby; and that I'll be going there again myself on the following Wednesday, the 13th.
I just haven't decided where exactly. Top candidates are Juf (the highest continually-inhabited settlement in Switzerland, and possibly in Europe); Müstair and its monastery; Sta. Maria in Val Müstair; Malles/Mals over the border in South Tirol; and Scuol-Tarasp, possibly with Samnaun (where they speak Bairisch rather than Allemannisch).
Does anyone have any travel recommendations for Grisons? :D