you don't like him because he always Annoying or put a prank on you and Dream can turn himself in to a small blob so he decided to make a idea on you..So he makes himself small and goes to your house

You were about to go home because it was rain heavily after you got home Infront of your door you saw the blob(him) sitting Infront of the door he was cold and sneezing a bit he can't talk on his blob version he can turn to his human version whatever he wants

Blob Dream: sneeze