Prince Harry was seen in the background of a photo featuring Massey University Professor Emeritus Gary Hermansson.
The university quickly spotted the prince and posted the photo on Twitter.
It must run in the family because Queen Elizabeth was also involved in a similar situation at the Commonwealth Games last week.
The queen showed up in a selfie of the Hockeyroos team from Australia and squad member Jayde Taylor posted the photo on Twitter.
As it turns out, Taylor also met the prince on Monday, although she opted to go with something other than a selfie, ostensibly at his request.