"I saw it on Youtube and I wanted to teach my class so I started with one set of cups and my watch to time it. I quickly realised that the kids were really into it," Kerr said.
"They like competing against each other, they like setting times and you don't have to be the fastest stacker, you set yourself a time and you beat the time."
To qualify for the record, students have to be stacking for half an hour on November 8 and every student at the school on London St took part.
Joining them from New Zealand were St Joseph's School, Woodville School and Muritai School, but not all schools could stack at the same time.
"It officially doesn't stop until tomorrow because the other countries haven't even woken up yet," Kerr said.
"You have to wait for all of the countries around the world to verify that they've done it before the results can come in."
St Mary's School students were part of an effort that set the record in 2015 and the certificate is proudly displayed in the school office.
However, they have been too busy with other activities for the past couple of years to participate and were not able to break the record again the following year.
"You can hear the kids yelling and screaming when they're stacking," Kerr said.
"It's good for the students to be able to have a certificate that says they're a world title holder and we love stacking in this school, so that's just the icing on the cake really."
The results will be in by the end of the year.
