For a party - with no warning - because PFB becomes grumpy if she's up too late.
Dh and I were frantically running around on last minute preparations/trying to shower and change while the three adults sat and expected us to wait on them.
Apparently one of the guests should've called to "tell" us they were coming early - but I would've still been p*d off at the thought of them turning up an hour before the party was due to start.