Tim has moments of trauma flashbacks where he reverts back into Joker Junior.
Just starts laughing uncontrollably, eyes glassy, dissociating and in a constant state of smiling creepily, flinching at every loud noise, and cheering when bad things happen.
The only thing that calms him in times like these is being hugged/cradled/soothed by Bruce or Babs. Others have tried, but their touch doesn't work.
He just sits in their lap as they work, rubbing his back and whispering words of comfort, until his laughing turns into sobs and he just fully collapses against them as they just hold him, rocking back and forth and whispering that he’s safe now, that they’ve got him.
When the tears run out and he’s wrung dry, he’ll slip away, head to his room and try to forget. They don’t follow. They want to, but they don't.
They don't talk about it, but maybe a new gadget or piece of tech, or improved device or nuclear codes will be waiting for them on their desk the next day,
Or maybe Tim will brew one of his special, extra strong cups of coffee for them after a particularly long patrol.