02/26/2012 09:51 pm ET | Updated Feb 27, 2012

'Who Is Billy Crystal?' Trending On Twitter

When Twitter users wondered who Paul McCartney was during the Grammy Awards two weeks ago, anyone with even a modest knowledge of pop music history was taken aback.

And when Billy Crystal took the stage to host the 84th annual Academy Awards this evening, we saw the generation gap widen even further as tweets such as "Who the heck is billy crystal?!" began to surface.

Presumably, those expressing the sentiments below have never seen "When Harry Met Sally," "The Princess Bride" or the eight previous Oscars shows Crystal has hosted.

They're baaaaaack.

Twitter Wonders Who Billy Crystal Is