15 sets of twins at a Sunnyside elementary school

SUNNYSIDE, Wash. -- An unusual sight at a Sunnyside elementary school has a lot of people doing double takes. Double vision is common, but eyeglasses aren't required.

Two halves make a whole has never been more true. It's double the giggles and double the fun at Pioneer Elementary School.

Don't let them fool you. It can get tricky.

"This year, our teachers got mixed up with us," said Vannessa Martinez.

"They need to try to guess which is which and that's what's fun being a twin," said Damian Sandoval. "You can trick people."

And, we're not just talking about one or two pairs of twins. At this school, there are 15 sets. It's nothing the teachers say they can't handle, even if there's a splash of chaos.

"When parents do dress them the same, they're hard to tell apart especially those identical ones," said Suhaill Nunez. "We're like, 'Who is that?'"

Vannessa and Annessa Martinez said it's a bond unlike any other.

"I like Annessa. She always wears cute clothes just like me," said Vannessa.

"I like Vannessa, my sister Vannessa, because she's always there for me. She never leaves me behind," said Annessa.

Teachers even notice the connection among them.

"It's a very strong bond," said Suhaill. "They're naturally drawn to each other and they want to interact constantly with each other."

The twins are spread out from pre-kindergarten through fourth grade. Only two sets are in the same class.