Well they arrive in London at this huge hotel. They're put up on the 10th floor. Off they trot on the pop and get back to the hotel about 2 o'clock in the morning. Paddy decides he wants to go for a swim.
Murphy is a bit miffed and asks "where the bl**dy hell can you go swimming at this time"
Paddy says " We can go in the Thames in our skiddies (underpants)"
Paddy then looks out onto his balcony and sees it's been raining; looking down at the shimmering road he shouts to Murphy "Oi -- the Thames is down here -- look!!!"
At that Murphy rips his clothes off revealing his Y-fronts sprints onto the balcony and dives off. SPLAT!! Straight into the road below.
After about five minutes he manages to pick himself up and shouts up to Paddy who's about to dive off the balcony.
Spoiler:
