Lex's previous encounters with the Joker were few, but always memorable. He suspected that any encounter with the Joker would be, however. He watched the clown paw his desk and made a mental note to order a new one. God only knew what the maniac carried with him.
"Yes. Your counterpart." His expression didn't change from its cool, slightly bored state. The only thing possibly more annoying than the Joker was Harley Quinn. Loud, childish, and idiotic, all mixed into one blonde package. "I'm surprised that you've kept her around so long. Especially with her numerous mistakes."
Luthor's eyes narrowed at the mention of "green". "You are referring to a highly radioactive and destructive alien element. One that has exactly one purpose and is regarded as somewhat illegal. And you come to me to request a sample."