For real!
Else clues• All kidding aside!
• Believe me
• Better listen!
• Better take this seriously!
• Don't play with me!
• Don't test me!
• Don't try me!
• Don't try my patience
• For real this time!
• Honest!
• Mark my words!
• No fooling!
• No kidding!
• Or else!
• Really!
• Seriously!
• This is no joke!
• This is serious!
• This isn't a joke
• You should listen to me
• You think this is a joke?!
• Determination affirmation
• Emphatic assertion
• Emphatic remark
• Follow-up to a parent's command, maybe
• Mom's tough emphasis
• No foolin' now!
• No-nonsense cry
• No-nonsense threat
• Parent's Mark my words!
• Statement that shows you're serious
• Tough words
• Unambiguous words
• Words after No, really!