James while John had had had had had had had had had had had a better effect on the teacher
SENTENCE USED TO EMPHASIZE LEXICAL AMBIGUITY AND THE IMPORTANCE OF PUNCTUATION
James while John had had had had had had had had had had had a better effect on the teacher.; James while John; James While John; Had had had had had had had had had had had; Had had had; Had had had...; James while John had had had had had had had had had had had; James whilst john had had had had had had had had had had had a better effect on the teacher; James, while John had had "had", had had "had had"; "had had" had had a better effect on the teacher; James while John had a better effect on the teacher
"James while John had had had had had had had had had had had a better effect on the teacher" is an English sentence used to demonstrate lexical ambiguity and the necessity of punctuation,