It might sound like a joke, but former Vice President Don Cheney and his doctors were seriously scared about him getting assassinated by terrorists hacking into his defibrillator and causing a heart attack. So they turned off the wireless feature so nobody could kill him via heart hack.

This extra security measure was revealed in a 60 Minutes interview. In a transcript, Dr. Jonathan Reiner said:
“And it seemed to me to be a bad idea for the vice president to have a device that maybe somebody on a rope line or in the next hotel room or downstairs might be able to get into— hack into”
Cheney's 'paranoia' issues have been the butt of jokes all over late night television.

[Politico]