Ellie was clearing the table (3 hours after lunch, I might add), a job that she and Tali share.  Tali was eating her ice cream and ignoring her. 

Ellie (dripping with sarcasm): That's ok, Tali. Don't get up.  You just keep sitting there.  I got it.

Tali (very sweetly): Ok. Thanks, Ellie!

Apparently, sarcasm is lost on a 5 year-old.