Déjà Vu 4: Holy Human Siamese Knot, Batman!

I totally missed this reference. I caught the "Binder Alley" reference but not the Human Siamese Knot - I thought that Waid was just goofing around. From scans_daily, here's a panel from Brave and Bold #5:

... and the "inspiration" for it (via YouTube video clip):

How did they get out of it? The leftmost Triplicate Girl must wiggle her ears while the rightmost one moves the fourth (ring) finger on her left hand. That's the key to getting out of a Human Siamese Knot, which I just remembered.