Four of the nine victims were minors, with three even younger than 14 years old.
The man was unhappy over a noise complaint against him.
He says he does not want to continue living like a "walking corpse".
SCDF conveyed one person to Khoo Teck Puat Hospital.
The incident happened after a dinner to celebrate their shared birthdays.
Netizens left comments such as: "Where can I be woken up by a beautiful officer?"
The shocking reveal sparked energetic debates among netizens.
The iguanas are reportedly abandoned pets which now pose a threat to the farmers' livelihood and the local ecosystem.
Several suggested the casket was most likely empty and placed in preparation for an upcoming wake.
The man claimed he did not realise the buns contained pork.