My face has gone blue

My doctor does surgery too
He cut off the lace from my shoe
I said, that’s my trainer
He said, you’re a failure
You can’t tie a knot without glue

But  how can we sleep in our bed
When our shoes to our feet have been wed?
Our feet would be grey
Our nails would decay
It came from the top of his head.

I  think that  a buckle would do
As alternative tye for my shoe
Then we could remove ’em
And wash our denouement
Oh,dear,now  my face has gone blue.