Hey. What if the Robins make up stories about Bruce to tell the Justice Leaguers? Dick: Oh yeah, one time Batman dressed up like a moose and rode a tricycle in order to bait a villain out of hiding. Jason: One time Batman got spooked and punched himself in the face. Tim: When Alfred was away Bruce tried serving us Medium-Rare chicken for dinner. ANd the JL believes them, so when they bring up the stories to Bruce he's just like WTF?
OMG YES! They all have goofy stories that they collaborate on and as a family agree to pretend are true. And the best thing is, some of the stories might have a little truth behind them like, “Yeah Bruce actually has a pink batsuit. He has one in every ROYGBIV Color actually.”