Vanilla slices should be fitted with guttering to catch the wayward cream. Whatever way you try to eat them you always end up with a cream moustache. If you have a real moustache as well this is a 'good thing' as cream can be retained for later consumption along with the odd cheese sandwich, pickled onion biscuit etc.
I like Tesco's Triple Belgian Chocolate cake, but I am only allowed a very measly portion. Sigh.