Examples:

• I think we're barking up the wrong tree.
• For 40 years, you've been barking up the wrong tree.
• But, uh, I think you're barking up the wrong tree.
• You're barking up the wrong tree with this one, Liliom.
• You're so barking up the wrong tree right there, my friend.
• So you, my friend, are barking up the wrong tree.
• You're barking up the wrong tree with this Ralph Twice.
• So you, my friend, are barking up the wrong tree.
• You're barking up the wrong tree in so many ways.
• We've been barking up the wrong tree the entire investigation.