Killer joke

Your evil is showing

AND SO IT SHALL! MWAHAHAHAHAHAHAHAHA!

...?

It's referring to the trailer,the kid Bill finds his little brother Georgie standing on water I think and Georgie says "Bill.If you come with me,you'll float too,*giggles*you'll float too,you'll float too,*louder*you'll floAT TOO,*yelling*YOU'LL FLOAT TOO!"