*They tell him about the ghost that appeared in the night. Why did Marcellus and Bernardo bring Horatio to the watch that night? *to see if the ghost would appear. *Horatio says it is just their immagination, so he joins them so if the ghost does appear, he will confirm it with his own eyes.
Answer:
It contains a comma splice.
Explanation:
"Don't stack twelve boxes on top of one another" and "it's the twelfth one that will knock down the pile" are independent clauses and should be linked by a colon, semicolon, or conjunction.