Reddit user sesipikai proposed to his girlfriend earlier this year (she said yes!) while the couple were visiting Rome, Italy.
After visiting the Colosseum the couple went to the Roman Forum where he popped the big question (after enjoying some delicious ice cream). Interested to chart his heart rate (bpm) during the marriage proposal he wore a heart rate monitor belt and detailed the moments before, during and after the proposal (about 40 minutes worth). Sesipikai says his typical resting heart rate is about 60 bpm.
As for how he knew the time/sequence of events, he also had a GPS tracker on and noted the time of the first event.
Congrats to the happy couple!