Longtong's breach

• London's bridge is falling down
• Wikipedia History of London Bridge
• Lyrics to the famous nursury ryhme, "London Bridge is Falling Down"

• breach - 1. An opening, a tear, or a rupture. A gap or rift, especially in or as if in a solid structure such as a dike or fortification. (2) A violation or infraction, as of a law, a legal obligation, or a promise. (3) A breaking up or disruption of friendly relations; an estrangement.
• britches or breeches - trousers, pants

• This sentence is similar to the puns used previously to describe a grandfather (HCE) falling and grandmother (ALP) spreading the table at the Wake.