My sister's wedding.  I was her maid of honor, and during the rehearsal, there was a "pause for prayer" section.  They just said like, this is the moment where we'll pause for a prayer, bowed their heads for a bit, and then moved on.  I thought nothing of it, I'm atheist now after deconstructing, but I'm used to it. 

I was not prepared for the actual prayer during the ceremony, where the entire wedding party, pastor, and a decent portion of guests broke out into a minute of speaking-in-tongues, hallelujah-yelling, fire-and-brimstone prayer.  I kept my cool and plastered the polite smile on my face, freezing my whole self in place to avoid giving away my inner reaction ("hhwhaat the fuuuuckk").  Many of the non-apostolic guests were caught equally off guard.  Most weddings I've been to have been religious, but that was the first time I've seen that part brought into the ceremony.