I'm pretty sure the saying is "Peace of Mind"...
Piece of mind does look pretty horrific when written down though. In fact, wasn't there an Iron Maiden album called 'Piece of Mind'?
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Well, to be fair, they are two entirely separate sayings, separated literally by the word "my" or any other pronoun. No one would say simply "I'm gonna give them a piece of mind."
As for Bert, I assumed he was being ironic.
Also, sometimes "ironic" makes me think of Zap Branagan which :barf:
sexlexia!
also dykslexia