I've seen a few - and yeah, its usually when they've been spooked by a good bounce, or something has caught fire. Or if the service was above par...
(Saw a fair few at Alliance? not sure for which reason there? Maybe it was just the oldies going to norfolk being polite, but that still doesn't explain why the paxing captain once joined in??)
On the other hand, it seemed to happen like clockwork landing in hong kong, and oddly, hervey bay...