You could screw up a chinese parade

When some one is excessively disorganized or substantially confuses a situation such that their actions could be compared to the apparent chaos of a Chinese parade.

Son: (forgets to do homework, arrives late home, accidentally falls off skateboard and breaks ankle, is late for work and his teacher from school expresses concern about his lack of preparation in class.)

Father: son, no offense but you could screw up a Chinese parade!