This one's for my fellow fly fishers.
The clinch knot isn't the strongest out there for tying your tippet to your fly (my default these days for most flies is actually the Orvis knot), but I have to confess that I use the unimproved clinch occasionally out of sheer laziness. (Sometimes I have cause to regret this decision later when a fish breaks off the fly.) But most of the time it suffices. I think my continued use of the clinch is also a result of having seen this video showing a super fast way to tie the knot. Caveat pescator!