Because one more would be too farty
By craic-ing his knuckles.
So they look like their mothers
239, because if there was 1 more it would be "Too Farty".
Because one more, and it would be too-farty.
Because any more would be too farty.
He stopped at 239 because if he added another one it would be 'too farty'. It would've been funnier if I could do an Irish accent.
Because just one more and it would be two-farty
Because 1 more would have been 240...