Lois handcuffs herself to Superman. Not only does Superman *not* bother to break the handcuffs, which he could do easily, but immediately after the bad guy shoots his flamethrower at them, it's clear that the handcuffs have broken off as they are standing too far apart to still be attached. Yet, after he flies away with Lois and they land on the top of the Daily Planet building, the handcuffs are still attached and only *then* does he break them.