There's a particularly beautiful genus of butterflies named after Thisbe and a particularly mediocre looking genus named after Pyramus. (Just kidding, Pyramus. Calm down.) (Source.)
The Beatles once performed the Pyramus and Thisbe scene from A Midsummer Night's Dream on TV. Check it out —just don't faint from fandom.
The mulberry tree's white berries are stained red by the blood of Pyramus and Thisbe at the end of the story, right? Well, this is bad news for any silk worms in the area, since the little buggers exist almost entirely on the sap from mulberry trees with white berries. (Source.)
A girl talks to her lover through a hole in a wall in the Smashing Pumpkins song, "Here's to the Atom Bomb." Sound like a familiar story? Only one of them dies in this one, though.