A lesson learnt!!
Not quite in line with the topic but... never, NEVER carry out a water drain check by yourself! Early one winters morning, 0 bloody hell o'clock, on a remote stand, dutifully carrying out the task only to have the drain to stick open!! There was BM, stuck on top of the ladder, thumb in hole, a la little dutch boy, do I run to the nearest phone, about 100 yards, or stay there hoping someone will pass? Luckily a colleague came by after a few minutes to assist. Only after the obligatory call to get eveyone else out to have a laugh and take the necessary photos!!