Fridayitis
A perplexing condition that suddenly strikes some workers and students on Friday and leads to their absence that day from work or school.
Fridayitis is an idiopathic disorder, one of unknown origin.
It can occur in sporadic form, affecting just that individual.
Or it can appear in epidemic form, decimating an office staff or school.
People suffering from Fridayitis have been overheard to exclaim: 'TGIF!' Also known as starttheweekendearlyitis.