We interrupt this giant pre-deposition document sorting to bring you an urgent homonym bulletin from the Grammar Commando. (Spell-check proof errors are the bane of the Internet.)
Yoke = Implement used to harness animals, like so:
Yolk = Middle part of the egg, like so:
In metaphorical use, "yoke" is the one that is used in phrases like "laying a heavy yoke" on someone. A heavy yolk would be pretty messy. If you use yolk in such a context . . . you'll have egg on your face.