...out of the blue, a friend asks if you could mend his precious kilt hose, oh and could it be done within a week please? You say yes, collect said hose, admire the argyle, find the hole and realize it's not too bad. Unravel until the broken bit can be sewn in, then kitchener the live stitches for an invisible repair. Doesn't even need a proper darn.
The kicker - discovering that, even though you're not a huge fan of grey, you have a skein of yarn in exactly the right colour and weight to match the hose.