Coupling (2000)

S2E3 Her Best Friend's Bottom

Steve unexpectedly drops by Susan's apartment and accidentally catches a glimpse of Sally's bare backside. This awkward mishap creates a series of uncomfortable situations for everyone involved. Jeff's classic sequence unfolds: first, they experience the prickles of an embarrassed silence, followed by the blurts where they all start talking too rapidly, and finally, they break the tension with the signature "head laugh."