Man dresses as a lobster to propose to his girlfriend

A man who wrote a book to propose to his girlfriend got a fairytale ending when she said yes.

Not only that, he pulled off the whole thing while dressed as a lobster.

Elsa Cremer was at work at Piper Preschool in Santa Monica, California, when her boss asked her to read a story to the kids while she was recorded for marketing purposes.

Read: Bride Upstaged by Proposal at Her Wedding: 'It Was a Big Misunderstanding'

"They told me the book I'd be reading was written by a friend of theirs," she explained on YouTube. "What they didn't tell me was that their "friend" was my boyfriend Joe Graceffa and that he had written and illustrated the book with a surprise ending just for me."

As her class listened in, she read the book, which Joe made through Mixbook.com with a coupon from his own website, and described the adventures of a lobster named Bobster.

As she neared the end of the book, she read: "Bobster got down on his lobster knee, he moved in close, he gave her a smile and asked..."

But as she turned the page, she saw it was blank. At that point, a large lobster appeared behind her - and it took Elsa a minute to realize it was her boyfriend Joe in disguise.

He dropped to his knee and finished off the last sentence by asking her to marry him. Elsa screamed as she accepted.

Read: Sofia Vergara and Joe Manganiello Share Photos from Their Caribbean Honeymoon

"I was thinking, all these places are places we've been!" she said of the book.

Elsa shared a video of the proposal to YouTube, signing off the post: "The Happiest Crab in the World."

Watch Below: How This Boyfriend Pulled Off a Roller Coaster Proposal