be like the Keystone Kops

To be seen as bumbling and inept. The original Keystone Kops were ineffectual policemen in Mack Sennett's early 20th-century slapstick comedies. The defensemen were like the Keystone Kops out there, banging into each other and just letting the other team score over and over again. If you two chaperones are like the Keystone Kops, yeah, of course the kids are not going to listen to you. We could totally shoplift from this place, the so-called "security guards" are like the Keystone Kops.