For a second, he wants to say that it's really none of Strange's business. All anyone has to do, as far as Joker is concerned, is just stay safe, not do anything stupid, and listen when the Ringmaster says not to do something. It's on the tip of his tongue too, shows perhaps a little bit in the exasperated fondness in his stare.... but then he comes to a pause.

Ah. Right.

"Yer under Mari, too, ain't ya?" he asks slowly, expression shifting into quiet realization as his body shifts against the coral he's come to rest against.