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Batman and Robin had arrived at the Watchtower at 6:00am, before even Martian Manhunter was awake.
"Ugh! Bruce, why'd we come this early?" Robin complained.
The Dark Knight smirked, "For entertainment of course."
Around 6:30, they neared the bathrooms after eating some food. Suddenly they heard a deep baritone voice.
"Oh where is my hairbrush? Oh where...is my hairbrush? Oh where, oh where, oh where, oh where, oh where, oh wheeeerrrre, is my hairbrush?" was sung as J'onn exited the bathroom in a towel. Let me repeat that, in a towel.
*Pause to let reader regain composer*
Robin was shocked and slightly embarrassed at the sight, Batman...was Batman, but he did the most unusual thing. (No he didn't start singing, idiots, just read.)
"I think I saw a hairbrush back there," Batty-boy responded.
"Back there is my hairbrush. Back there is my hairbrush. Back there, back there, oh where, back there, oh where, oh where, back theeeerrrreeee, is my hairbrush!" sang J'onn happily.
Robin stared at him, first at his head, then to his towel, then quickly back to his head again and asked, "Why do you need a hairbrush, you don't have any hair!"
M.M.H. froze, the thought had never occurred to him, no hair for his hairbrush? What would become of him? What would become of his hairbrush? "No hair for my hairbrush. No hair for my hairbrush! No hair, No hair, back there, no hair, no haaaaiiiirrrr, for my hairbrush."
As they walked down the hallway they ran into Superman, who had heard the commotion and came to contribute to the conversation, "J'onn, that old hairbrush of yours, well, you never use it, you don't really need it so, I'm sorry, I didn't know, but I gave it to the Flash, 'cuz he's got hair," and with that he walked away.
"Not fair, for my hairbrush. Not fair, my poor hairbrush. Not fair, not fair, not there, back there, no hair, not faaaiiirrr, my little hairbrush," lamented Manhunter.
Hearing J'onn's song, Flash enters the scene, himself in a towel, shocked and slightly embarrassed at the sight of...each other, Flash regains his composer and says, "Thanks for the hairbrush," and flashed away to get dressed.
M&M thought for a second, smiled and then sang, "Take care, of my hairbrush. Take care, of my hairbrush. Take care, no hair, back there, oh where, take caaaarrrreeee of my hairbrush!" and walked to his room.
Batman looked at Robin, "That, Dick is why I come early."
"Ohhh," the Boy Wonder said, "so that's what you meant by entertainment. Do they do the same thing every day?"
Bruce Wayne sighed, "No, they do something different every week. Somehow I got stuck with the crazies."
From then until Robin became his own superhero, Dick went with Bruce every week to be entertained.