There's this town with two blacksmiths - one, a swordsmaker and the other, a shield maker. The swordsmaker's swords can slice through anything as a rule and the other guy's shields cannot be destroyed. Now they get cut up with each other for some reason and pit their wares against each other. What do you expect happens?
The 'immovable vs the irresistible' is the obvious. Does Gareth have some other option?? Maybe the thought in mind is a struggle forever for one object to overcome the other.
Other than something like this, Gareth needs to give an explanation.