zlacker

I learned to tie Ian's Secure Knot when I had a pair of shoelaces that liked to come untied constantly (I guess the material was too slippery, or something). Never had the problem again.

Some other trivial life hacks aren't necessarily worth it in practice. With the T-shirt folding one, for instance, the bottom shirt of a stack of shirts tends to unfold itself when you pick up the stack, since one arm of the shirt is basically just folded underneath. The mild inconvenience outweighed the mild convenience for me, and I no longer fold shirts that way.

I'll probably tie my shoes with Ian's knot for life, though.