Why Did You Do It?

An example of the failure of languange in bringing out irony.
(The bracketed is Chinese)

Q: What does it mean? (Shen3 Me4 Yi4 Shi4)
A: It has no meaning. (Mei2 Shen3 Me4 Yi4 Shi1)
Q: Then why did you do it?
A: Just for... (Yi4 Shi4 Yi4 Shi4 lor)