Then I decided I couldn't be bothered doing the Maths.
The statistical possibilities of having 2 sets of 2 people that share the same birthday out of a group of 10 have got to be utterly ridiculous!
And I still can't be arsed to work it out.
2 out of 10,
0.027
2 sets of 2 out of 10
0.00000695
Although it could be that people born certain days were destined to be good at GT4.