blood!

Granddad is playing Lorcan's favourite game: sitting him on his knee and letting him swing his head, leaning back and forwards. Granny gets a little worried:

Granny: Shay! Careful! Don't let him stay down there so long! All the blood will rush to his head!

Liam [Jumping up instantly and speaking in a tone of sheer morbid excitement]: Blood! What blood! Where?!!