my gf's daughter (age 5) had a cyanotic spell last night (turned blue from being frightened and crying). She straight up stopped breathing. Having the CPR steps drilled in to my head put me on autopilot, which was really reassuring, even though it's been awhile since I last took the class. Thankfully the sternum rub caused a lot of pain and her to start crying (and thus breathing) so I didn't need to call 911.