Well, he’s not going to marry her. Maybe he was, but he’s not going to jump in a tank with a school of sharks – now!
– Tennessee Williams
A Streetcar Named Desire, Scene 7. Stanley sabotages Blanche’s chance of happiness with Mitch by telling him about her promiscuous past. Presenting Blanche as someone to be shunned, he uses a metaphor to compare marrying her to jumping into a tank full of sharks.