1. RNG when walking to work. There's a scene where a police officer accosts you and you have a choice to suck his horse's dickWhere do I find a horse?
I often have problems getting this event to trigger in part because it's pure RNG based on an action you do 5 times a week.
2. RNG when taking a taxi home. There's a scene where you get picked up by a horse and carriage. This unlocks the ability to get free rides by servicing his horse from then on.
I have a much easier time triggering this one. Probability's much higher and the act is repeatable as long as you have money (which you probably have plenty of at this point in the game).