(Breadmaster) Very nearly right. You need 23 people, so add in the ref. The chances for 22 people are 47.6%, and for 23, 50.7%. With 50 people the chances are 97.0% and, needless to say, with 365 it's 100%. None of this takes into account those unfortunates born on 29 Feb in a leap year.
Lilith the Psychotic Ferret, as we can figure out, is an Aquarius (we think she was born late January-early February)...what that means for ferrets, God only knows. :)
I torched a load of very dry hedge clippings today - there's nothing quite so good for the soul as a smoking and roaring great bonfire and hearing the neighbours spluttering as they rush to bring in the washing from the clouds of billowing smoke. And don't tell me about dioxins and furans and the products of incomplete combustion - I know. But unlike my neighbours ( I know what they ate just about every weekend this summer - I could always smell it cooking), I haven't had a barbecue for two years and so I reckon I'm entitled. :o)