What would happen if, say, a person who isn’t a priest were to be Consecrated a bishop? Or what if someone who was never even baptised in the first place were ordained a priest or Bishop? Would the ordinations be valid? Does the ordination somehow confer along with it the Sacraments of Initiation? I find it hard to imagine that a baptism could occur after the ordination.
Or what if two non-Catholics were to be married by a priest? If they later decide to become Catholic, would the marriage administered by the priest still be valid, or do they have to get validation?
What if one were to receive holy orders or matrimony without having been Confirmed first?
Lastly, what if a sacramentally married person were to join the religious or priestly life without having gotten any annulment?
(Let’s please not turn this into a discussion of this and that being against Church rules; I’m already aware of that. The question pertains to the validity of these sacraments in these circumstances. There are always dismissive users like that who really don’t add anything to the conversation.)