General Sarcasm:
* "Sure, why not?"
* "Sounds legit."
* "Oh, fantastic."
* "Totally believable."
* "Brilliant, as always."
* "You're so right."
* "No way, right?"
* "Of course, duh."
On People:
* "He's a genius."
* "She's a gem."
* "They're so helpful."
* "Such a good idea."
On Situations:
* "Smooth sailing."
* "What could go wrong?"
* "Easy peasy."
* "It's all good."
Remember: The tone of voice and context are essential in conveying sarcasm. These phrases work best when used with a knowing smirk or a raised eyebrow!