
If you believe that, you’ll believe anything
Sarcasm Alert
This phrase is often used sarcastically to mock someone's credulity.

He claimed he'd been to Mars. If you believe that, you'll believe anything.
Not Literal
It's not meant to be taken literally; it exaggerates to make a point.

She says she knows the president personally. If you believe that, you’ll believe anything.
Colloquialism
The phrase is informal and best used in casual conversation, not formal writing.

He's promised not to be late again—if you believe that, you'll believe anything!
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