Here is a croatian joke i tried my best to translate
A man and his friend walk around a forest, both of them haven't eat for days.
They reach a small cottage in the forest and the man's friend enters the cottage.
In the cottage he finds an grandma and he asks her if he can eat.
The grandma replies with a yes but only if he forgets her.
Without hesitation the man's friend leaves the cottage and tells the other man what happened.
The other man enters the cottage and the same story happens as the last man, except he doesn't leave.
He agrees to forget the grandma but if she only has her eyes closed, the grandma agrees on that.
The man uses a corn cob to forget the grandma, after he is done he throws the cob out the window.
The man eats and after he is finished eating, leaves to see how his friend is doing.
His friend laughs at him then says: "You had to forget that grandma to eat while i found a corn cob on the ground and ate it"