Idk about the pacemaker part being funny. This has actually been done before. There's a publication about it.
Viewing post in HEART_ATTACK jam comments
https://www.healthline.com/health-news/are-pacemakers-defibrillators-vulnerable-...
https://hackaday.com/2017/05/27/radio-controlled-pacemakers-are-easily-hacked/
https://www.wired.com/story/pacemaker-hack-malware-black-hat/
https://arstechnica.com/information-technology/2018/08/lack-of-encryption-makes-hacks-on-life-saving-pacemakers-shockingly-easy/
There's a reason why I'm so vehement about encryption in medical devices...