Not custard creams, that's for certain.
Why not? I drank a Belgian Dubbel last night that tasted of chocolate with dandelion & burdock!
Even 'traditional' beer styles can taste of citrus, grapefruit, lemon, orange, corriander, pine, chocolate, coffee, toffee, bread, biscuit, banana, clove, milk, vanilla and that's before we talk about beers made with extra adjuncts and ingredients such as fruit, coffee, cacao, herbs and spices.
Craft brewers are just pushing these flavour profiles and boundaries further by experimenting with differing ingredients, hop quantites and flavour combinations and coming up with some amazing beer.
Northern Monk recently brewed a beer designed to taste like neapolitan ice cream, and it's being lauded as one of the best beers of the year so far!
This doesn't excuse the above video, by the way, which I think is a bit "for the sake of it" and silly.