Emergency! S04 E08 Quicker Than the Eye

"Squad 51, this is Rampart. Continue to monitor patient and transport immediately."

Tired of Chet's antics, the guys at the station get their revenge by playing practical jokes of their own. A gun discharges by accident and injures a pregnant woman, a construction worker caught under a boat refuses an IV, and a man in a motorcycle accident communicates through his thumb.