Six congregation members ended up in the emergency room in the US after attending church.
A 74-year-old parishioner, identified as a Mr Jones, is allegedly to blame.
Mr Jones baked some cookies and took them to church.
The other congregants thought they were partaking in a bit of sinful cookie eating, but didn't realise just how sinful.
The churchgoers, aged 12 to 70, ended up in the emergency room after attending a service at the St John's Apostle Catholic Church in Bloomington, Indiana, in the US.