Top 5 IOIs

[Bitchwhipper2]

1. Eye contact with random girls outside
2. Cashier says hello to you
3. Grandma hugs you
4. Your astrology signs match
5. Girl sits next to you on subway (she wants to suck your cock)

 

[Vermilioncore]

6. A girl is kind to you

 

[Deleted member 28896]

yesyesyesss

 

[Kamui]

 

[MongolTurk]

Missed the biggest one: She looks in your direction and/or avoids looking in your direction and/or is in a somewhat close proximity to you(500 meters)