Laboratory
Have one on your country place.
Letter L
Lucky
Speaking of a lucky man: "He was born tagged." You will not know what you are talking about and neither will your listener.
More from Letter L
Laconic
Idiom no longer spoken.
Lacustrian (towns)
Deny their existence, since it is obviously impossible to live under water.
Ladies
Always come first. "God bless them!" Never say: "Your good lady is in the drawing-room."
Lads
Never give a commencement address without referring to "you young lads" (which is tautological).
Lafayette
General who is famous for his white horse.