On top of that, there are no such things as happy programmers. Why didn't anyone point that out?

I love that this is the first comment.

    o = (function() {
            p = 'programmer';
            d = 'day';
            h = 'Happy';
            r =  Math.floor((Math.random()*10000));
            (r % 2 === 0)?ap="'s":ap="s'";
            return h + ' ' + p + ap + ' ' + d;
        });
    o();

awaits correction

fixed!

Incorrect. The apostrophe is only after the possessive if the thing it's owning is plural in addition to the possessive. Day is not plural.