And write an incomplete sentence. All for effect, of course. My admonitions to undergraduates to the contrary, cleaning up our English entirely would take a lot of joy out of life. The tics and twists of dialect and bad grammar for effect are one thing, however. Unconscious and unintended mistakes have pleasures of their own.
Mixed metaphors deserve special mention because truly great ones hang like rude noises in the air.
There is no way of taking them back, no form of rhetorical damage control. The speech did indeed send its hearers to the barricades, but a fair number of them were giggling, and not for the usual reasons. The problem with mixed metaphors and most fun forms of bad English is that they are not participant sports. The hearer or reader can only smile, laugh, or stand in awe at the author or orator's creativity in mangling the language. There is, however, an exception, and in recent years it has become my favorite crime against English.