Pictures are great.
Take lots of photos with your friends and family, folks. Since that's sometimes all you'll have when they're gone or lives have drifted apart. There's years-long stretches of time where I'm not in any family albums except for the one or two obligational shots at Christmas...
Yeah as funny as it is to joke, the other person will generally know something's up within the first few seconds.
It was a quality that early anesthesiologists liked as it was a slow, easy procedure to induce unconsciousness rather than an "Oh no, they have suddenly stopped breathing" a minute...