J F'n C
A loud and very rude way to express shock. Use it in church if you're ready for the holy spirit to come down and zap you.
He shouted "J F'n C!" when the pastor pulled out a giant holy chicken and made it preach.
She yelled "J F'n C!" when the church roof fell down during the sermon.
He said "J F'n C!" when the priest started speaking in tongues and the whole congregation started dancing.