[Arkanosis]

Shoe lacing. Then I found out Ian's fantastic website:

https://www.fieggen.com/shoelace/grannyknot.htm

Small, but life-changing discovery.

[Mordisquitos]

After years and years on my mental backlog, having first seen it ages ago, I finally started using the Ian Knot (World's Fastest Shoelace Knot) to tie my shoes and similar bow knots: https://www.fieggen.com/shoelace/ianknot.htm