I really want to believe that a journalist was aiming for a punnish-like thing in composing this headline, but it’s more likely that s/he simply didn’t think this through:

Rare gladiator marbles discovered in major Italian art bust

Rare because gladiators weren’t big marble players; they preferred tetherball. And these must be really special marbles, too, because they were discovered during an art bust (“*in* an actual bust, as the headline could also be read, would be stretching my patience just too far), so they’re probably collectibles!

(Yes, I know what marbles are. But I’ll bet that at least eighty percent of people who encountered this headline didn’t until they read the article.)