Chocolate pumpkin cake

For a few months now we've been trying to think of how to get Glen to eat some pumpkin, and his birthday provided a perfect opportunity... Vince and I thought we would do this in the form of a yummy chocolate pumpkin pie... It's a very easy recipe, just take a box of instant chocolate cake mix and add about a cup and a half of pumpkin and an egg or two to get the right consistency and there you have it, a yummy cake... And the best thing is that nobody can tell it has any pumpkin in it, it tastes like normal cake... Glen really enjoyed eating the cake, but unfortunately after he found out it had pumpkin in it he couldn't eat any more of it and is now suspicious of all cakes...