Sonrie Y Muerete..Otra Vez!/Say Cheese And Die Again! by R. L. Stine (1996, Paperback)

when greg tells his story of the evil camera for his true life report, his teacher, mr. saur, gives him an F. no one belives the story, least of all, mr. saur. to prove that he's not lieing, greg decides to sneak back to the old house and steal the camera again. he vows to not take any picture, just show it to mr. saur. but while in a fighting match with his friend, his and and his friend's picture is taken. now the two of them must find away to conteract the photos, before it's too late.
this is another great installment from the goosebump series. r.l. stine has done a great job, just like the other books in this series.