Captain's sense of humour runs towards... awkward and embarrassing displays, usually. There is a passage from their canon in which they spent a period of time dressing Snippy up in different outfits while he slept in order to enact a day of festivities -- there were a few but the two I remember were 'Aunt Snippy' and 'Zombie Snippy', both to disastrous results.

Pranks are definitely on the docket! Whether or not they detract from duty depends upon how one defines the term.

In any case, I'll set up a top-level some time if you want Wedge to join in either for or against whatever travesty Captain has planned!