P is for prisoner!
Because the suspicious character got caught.

Q is for quarrelsome prisoner that demands to speak to his lawyer.

R is for the robbers who snuck in while the circus was being distracted with the prisoner.

S is for Surprise! The clown car just arrived with 20 security inside it.

T is for the tricky situation the criminals have found themselves in.

U is for the clown Union demanding they don't stack more than 15 clowns in a single vehicle for safety reasons

V is for the vehicle breaking down because too many clowns had been in it.

W is for wonderment because the children have never seen so many clowns in one place before.

X is for the xylophone playing in the background. Probably by one of the injured clowns.

Y is for the yelling that's struggling to be heard over the xylophone. I think it's calling for an ambulance.

A is for arial attorney, who swings down from the trapeze! Someone is getting sued here.

B is for the brawler in the audience, who started swinging his fists at everyone.

C is for some child's cotton candy he also hit on accident.

D is for dancers dancing gracefully through the air.