Examples:

• But mark my words, it's the last time I shall ever do so.
• But mark my words, all of you, there'll be some changes made in this town.
• This ain't over, you mark my words.
• There is still work to be done. And, mark my words, it will be done.
• No, I don't. It's a woman, mark my words.
• The people that you meet there will stay with you for the rest of your life, mark my words.
• You mark my words, young lady, you'll live to regret it, and you won't get any sympathy from me, either.
• This terrifying reality demands an intensive and cohesive European approach, and, mark my words, both internally and externally.
• But mark my words: One of these days, she'll give her the greatest cut Olive's ever had in her life.
• He'll soon regret what he did and will ask you to forgive him. You'll see, mark my words.