The narrator states that one of the minions masters like to have parties all night while sleep all day. That master is Count Dracula.
On his 357th birthday, the Minions wanted to make a surprise for Dracula, so they wake him up, open the curtain and give him a fine birthday cake. However, the thing that they forget was that vampires hate sunlight, which makes him scream and he turns into ashes under sunlight. One of the Minions chuckles nervously and blows the dust and the remains of Dracula collapses, while another minion sneezed when the ash flies to him.