burst into laughter
break out laughing
crack up

Often he burst into laughter when his children did something ridiculous.

They burst into laughter, because of all the possible offenders, he was the least likely.

We stared at each other for a moment before bursting into laughter.

She wasn't sure whether to burst into tears or wild laughter.

It was too much for her sense of humor; she burst into laughter.

Then she burst into laughter at the expression on her father's face.

When Tom told him about the dolphins, he too burst into laughter.

But every time he speaks, his friends burst into laughter.

He had no choice but to burst into laughter as well.

It was so funny that I almost burst into laughter.