Hey! Those aren't the top five signs! These are..

1 They run you a bath and you find they put pirahnas in there!

2 You find they left a poisenous snake in your bed!

3 They've bought arsenic for no explainable reason!

4 The brakes on your car don't work, and it passed it's MOT last week!

5 You put pirahanas in their bath, a snake in their bed, you buy arsenic, and you take the brakes off their car!!!