Here are some of the things I've done:
Get around in a foreign country
Do their own taxes (but not since I married an accountant)
Change a tire
Unclog a drain
Tell which direction they are facing
Put together a piece of "some assembly required" furniture
Buy something crazy expensive just because they want it (the scary part is $100 is crazy expensive for me!)
And things I still need to learn:
Mix at least a few classic cocktails
Jump a car battery
Carve a turkey
Paint a room
Apply makeup without a mirror