Shabby packed up numerous food items from the kitchen, including potatoes, tinned tomatoes and parsnips before heading outside with the others while most of the other housemates were asleep in the bedroom.
Rachael guarded the door while the others went into the garden, telling them, "I'll just loiter around".
Using the food, the girls spelled out the word "TWIST" next to the hot tub, and Ife threw a number of tinned cans into the hot tub itself, in an effort to make it appear as though someone was sending the housemates a warning.
"We're such d**kheads", Shabby said upon surveying their message, before Ife announced, "It's f**king brilliant".
She told the others, "Tomorrow, we've got to not let it slip", as they quickly headed in to the bathroom to avoid raising any suspicion from their sleeping housemates.