Much Ado About Nothing
What type of irony?
Act IV
Olivia declares her love for Cesario to Sebstian (because Cesario[Viola] looks just like her brother). Sebastian plays along and takes part.
"What relish is in this?
Or I am mad, or else this is a dream.
Let fancy still my sense in Lethe steep;
If it be thus to dream, still let me sleep!"
Avt IV/ Scene I