Probably my favorite commute ever (even though I was freezing due to not having the right clothes on) was when it started snowing about 30 minutes before I left work. The canal tow path was dusted, and the water was just cold enough that the snow settled on it, rather than melt. Since the section I rode on was essentially at the high point of the system, the water wasn't moving very quickly, and it blanketed the whole thing in white. In retrospect, I should've gotten on the road, as it would've been super easy to snag a wheel in a covered rut/hole, but...