When did Sesame Street jump the shark?

Me, I say it jumped when Elmo was introduced. Some others feel that it jumped when Mr. Snuffleupagus's existence was confirmed to others besides Big Bird. Hardliners feel that everything after Mr. Hooper's death is but a pale imitation of the true Street.

What say you?
Update: NOTE: "Jump the Shark" is a term indicating the point at which a good TV series sharply decreased in quality and began to suck. www.jumptheshark.com explains.
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