I don't know about all that
A way of saying you're not in on the stupid plan and you're probably going to tell everyone else about it.
'I don't know about all that,' said the kid who was already telling the other kids the plan was dumb.
'I don't know about all that,' said the person who had no idea why the plan involved glitter.
'I don't know about all that,' said the dog who had no idea what a plan was.