A housecarl that actually picks up all those leeks, apples and crockery that magically fall on the floor when I leave my house.
It would fit in perfectly with:
Look at Lydia, press E...
"I want you to...."
(Next selection):
'Clean up that @$ing mess!'
'Fetch me my dragonbone armour'
'Actually cook something in that pot and store it in the chest with my potions'.