Heptaphobia

heptaphobia (from hepta, Greek for "seven"), also known as septaphobia (from septem, Latin for "7"), is the fear of. although it is the most common favorite number, few people can fear or get phobic of the number 7. to go along that the number is considered lucky, this fear of number can be associated with the fear of luck. heptaphobia can also be associated with the fear of sin, since there are. in China, the number is associated with abandonment, angere, and death and their 7th month is called "The Ghost Month". heptaphobes would avoid having quantities of 7, like not having 7 people in the house nor in the swimming pool. many sufferers would wish to have eight days per week, especially from those who hear about the film  or. heptaphobes would be afraid of turning 7 years old

The most notable sufferer from the SML web series was Jeffy. The main cause of his Heptaphobia was a 7 8 9 joke due to the three numbers sounding like the phrase "Seven ate nine". Related note, Most heptaphobes got their fear from the “Seven ate nine” joke.