Firefighters want to track down the Christchurch locals, who made the trip two nights in a row.
One local firefighter's keen to give it pride of place at the Fire Station's reception.
Residents of other valleys have restricted access to their homes.
"Keep supporting our team because we need it at the moment."
It is thought smoke in the atmosphere affects its appearance.
"It's one of a kind, could be the only one in the world - definitely the only one in New Zealand."
If you want to avoid the summer heat this week, here's where you need to go.
Most regions will have daily highs of at least 27degC.
Stephen Frost threw a builder's peg at it before standing on its neck.
Flynn Taylor and Mason Nicklin were on the search for "something cool" - and they found it.
It missed the driver and hit the passenger riding on the back.
Head of policy Chris Lehane says New Zealand has an "incredible brand".
Limes currently only operate in Christchurch and Auckland.
A second deluge is expected for the South Island as warm weather continues in the north.