The FEAR AI was brilliant because of its relative simplicity; it had a few goals- seek cover, flank the player laterally, etc.- that the levels were specifically built to allow it to pursue. Unfortunately things kind of fell apart when the AI fought itself.
I've played through the game three times, and somehow I never noticed this before.One of the boss fights in Persona 5 is against a gangster whose ultimate battle form is basically a human fly. When he transforms, his speech becomes very...well, "pretty fly for a white guy" is the phrase that comes to mind. That's not the insignificant detail I'm referring to, however.
One stage of his boss battle has him fighting using a giant mechanical piggy bank. Its ultimate attack has him basically barrel rolling on top of it while it prepares to charge at and crush your party. He's not simply doing the standard "balance on a rolling barrel" hopping, however. He's doing the Gangnam Style dance.