Going close to the edges
I have to admit to being one of those GA pilots who goes right up to the edge of controlled airspace, because I'm trying to go from A to B to C as quickly as possible, without an engine.
A good example would be yesterday, which was probably the best gliding day I've ever experienced. I've checked my trace, and I'm clear of airspace, as least within the bounds of GPS accuracy and pressure altimetry, but I did all of the following:
* climbing to 100' below airspace at 5500' and FL65 (multiple times)
* skirting round the edge of some class D (within 1km for several track km, twice)
* over the top of several (M)ATZs and into a MATZ stub
* through (non-bye-lawed) danger areas (3 times)
All of this done without benefit of radio (although I would have liked one so I could call for a class D transit, and let Boscombe know what I was up to).
So, us glider pilots are a bit anti-social by power standards. I've always wondered how much we actually p*ss off ATC, and whether this is a factor in the CAA Mode S debate (not that I want to open that up here).