My dad texted all his kids the final line of Harry Potter and the Cursed Child and was disappointed that none of us complained about the spoiler

Adding "DId I read the entire play for NOTHING?"

Out of context does it matter?

Nope

Also we're used to him doing things like that

Sometimes he'll do the first line, "and then there's a bunch of sentences" and the last line

Or the first sentence on page three, the seventh sentence of page 42, the fifth sentence of page 77...

The most amusing was the year he got me two books for Christmas and kept switching the protaganist's names in his "spoilers"