Good question.

A lady I know got a resume once with a teabag and an individually wrapped biscuit, with a note saying to sit back and enjoy reading their application ... the resume (but not the teabag or biscuit!!) ended up in the bin without being read. She took it as a really crap attempt at bribery - when I'm pretty confident that it was just the applicant's sense of humour.

But I'm guessing it's another situation where you have to know your audience.

If in doubt, leave it out.