Part way through watching, bells start ringing.
**SPOILER!**
When he said he wasn’t firing blanks, I said to my husband “Oh, he could have impregnated himself”! Then later on, I paused the film, after we realised who John was, and I said the baby was Jane and was brought back in time! Weird effing movie, but fun!
Proper bootstrap, love the song “I was my grandfather”.