I did this while my daughter was in my wife’s womb. They tried to say that we couldn’t make any recordings of the ultrasounds. I made recordings of the ultrasounds. They asked me to stop, and I didn’t stop, and that was the end of it.
Admittedly you have to be willing to break social norms for this to even be an option, which is immensely difficult for most polite people. My solution was to remind myself I wasn’t being rude, and that I was a paying customer. (Unlike most people who say "I’m a paying customer," I always treat everybody well and respectfully; it still boggles my mind how awful most people are to e.g. support reps who are only doing their job. But this isn’t that situation, and it’s useful to remember that sometimes it’s true that you’re a paying customer and deserve to get your money’s worth when the only obvious downside is "they’ll be slightly annoyed for a few minutes.")