In The DC World With Marvel Chat Group Chapter 1997: U: Beyond Big Events (86)
It all started with that barbecue.
When Red Hood and Red Robin passed by, Bruce and Jack had already finished the barbecue, and they didn't get to eat at all.
But the fact that Batman and the Joker had barbecue together was still a bit shocking. Later, Red Robin discussed with the Red Hood that they should investigate the matter together.
It's definitely not possible to ask Batman directly, but it makes no difference to ask the Joker, and Red Robin
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