Can we use question tags in a sarcastic way?

[Vandbala]

I've been watching a lot of series lately, and I'd like to know if we could use question tags in a sarcastic way, something kind of like this:
1 --> He is interesting, isn't he?
2 --> Oh, is... he?

 

[probus]

Not only can you do so, but it is very common in speech. Here are some examples:

1. Really?
2. Seriously?
3. You think?

1 and 2 are often, but not always, sarcastic or ironic. Number 3 is invariably sarcastic.

 

[Tarheel]

Be aware that what works in speech doesn't always work so well in writing.

 

[5jj]

1 --> He is interesting, isn't he?

That's a question tag.

2 --> Oh, is... he?

That isn't.

1. Really?
2. Seriously?
3. You think?

And those aren't.

 

[probus]

As @5jj has pointed out, my earlier post was unclear. What I meant, and should have said, was that 3 can be sarcastic when used as a question tag.

1. That's what she said, really?
2. That's what she said, seriously?
3. That's what she said, you think?

 

[jutfrank]

1. That's what she said, really?
2. That's what she said, seriously?
3. That's what she said, you think?

I've never come across anything like this before. Could it be a Canadian thing?

 

[5jj]

What I meant, and should have said, was that 3 can be sarcastic when used as a question tag.

3. That's what she said, you think?

There is not what we traditionally call a question tag in #3. We see a question tag in: That's what she said, did/didn't she?

 

[SoothingDave]

"I don't know, can we?"

It's all about the inflection.

 

[Skrej]

I'd like to know if we could use question tags in a sarcastic way.

Well, you'd certainly think so, wouldn't you?

This was meant as a sarcastic example of confirming 'yes', but as SoothingDave mentioned, tone and inflection is going to carry the sarcasm much better than simple text.