He wears a hat to protect his bald 'dome' from the summer sun.
The team's new stadium is a 'dome'.
the 'dome' of the Capitol building
(..) Good lord, I'm trapped. What kind of trickery is this? You mad genius. Your dark gift has finally paid off. It, it has? This dome is obviously lined with copper. - Yeah, so? - Sir! Copper drains my powers. Your weakness is copper? You're kidding, right? (..)2010 Megamind