I was thumbing through Strunk and White's Elements of Style, Third Edition. Under "Misused words and expressions" on page 61: This. The pronoun "this," referring to the complete sense of a preceding sentence or clause, can't always carry the load and so may produce an imprecise statement. Under "An approach to style" on page 79: [...] Usually we think only of the ludicrous aspect of ambiguity; we enjoy it when the Times tells us that Nelson Rockefeller is "chairman of the Museum of Modern Art, which he entered in a fireman's raincoat during a recent fire, and founded the Museum of Primitive Art. This we all love.
(From the "Rest" of RHF)