What's the difference between a well dressed man on a unicycle and a poorly dressed man on a bike?

Once defined by a logical man as repetition with expected change, The common man may describe me as behaviour that is strange, Criminals may use to me to plea unsoundness of mind, But the clinical community have left this term long behind

I'm one for a coverup, but I am no swimsuit. When truth's hard to handle, I trim and dilute.

I feel like I'm seeing stars Did this just fall on my head Cartoons know this is funny but this container cannot hold honey.

What do Jim Carrey, Cher, and the phantom of the opera all have in common?