Instant Index: Justin Timberlake Stuns Singing Fans With Surprise Visit

David Muir reveals the top stories that have people buzzing this week.
1:10 | 03/30/13

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Transcript for Instant Index: Justin Timberlake Stuns Singing Fans With Surprise Visit
♪ ♪ fixodent,and forget it. Topping our "instant index" this night before easter, a new move to protect the bunny that inspired this classic song. ♪ Here comes peter cotton tail hopping down the bunny trail ♪ the question tonight how much longer they're out to save the new england cotton tail. Their numbers are dwindling as their natural habitat vanishes. Conservationists are restoring shrubs and breeding them hoping to have them from going on the endangered species list. Before the easter bunny sends so many on the hunt, justin timberlake has his fans on a scavenger hunt. Five albums were signed and five lucky fans found them with clues the singer had been tweeting out. Meantime, other fans got a huge shot while shooting an ad for target. They thought they were invited to sing a timberlake song. They didn't know they'd be singing it with timberlake. ♪ And now I'm whole show me how -- yeah. Aagh! . ♪ Show me how to fight for now ♪ oh, my god. Target by the way just releasing these outtakes from the ad. It's already gone viral tonight.

This transcript has been automatically generated and may not be 100% accurate.

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