Funny I love doing this

So you know how everyone uses sarcasm right or says something but doesn't actually mean that?

When someone does that to me in real life I take it seriously and for example I am like

Sarcastic dude: Can I have some onions with my fries?

Me: Yeah, sure. I'll get one made up for you right now.

Sarcastic dude: Wait, I didn't mean that.

Not my best, it's more funny when your in the 'moment'

Does anyone else like trolling people with this?