Taking you for an ice cream
To be misinformed by a person for their own amusement, often resulting in you looking foolish.  Often used by cockney wideboys from Dagenham.
Bob - "Geezer, I got that Belvin's phone number and I'm going on a date with her."

Marc - "Really? oh man she's so hot!"

Bob - "Nah mate, not really - I'm taking you for an ice cream!"

Marc - "Oh geezer, that is not jungle!"