That... wasn't really a joke, Yosuke.

Story time: Anytime you our someone else was going to eat or otherwise consume someone else's pet

So my group was plaYong the 5th ed ravenloft book Curse of Strahd and we were starting in death house and we found a room with a sacrificial altar in the middle.The first thing the barbarian thinks to do is toss the halfling fighter(me) onto the creepy altar.When it was later revealed you must sacrifice something to safely leave the altar guess who's pet mouse was the first to be volunteered.

*playing

*playing

Oh God, I'm getting flashbacks.

Guys, I don't care how funny you think you're being, don't joke about eating someone else's character or their pets or else you're gonna start engendering some major trust issues. Don't do it!

gesch, i only took an eye, you know it's my family's favorite snacks. Don't see what the fuss is about, give me a week or two, a year tops, and i will figure out a regen spell to restore the depth perception...

Yeah, that's a realy stupid thing to do. I've had a group where one guy tried repeatedly to eat one of our horses. When he can't ride, and we already don't have enough for the whole group.

Honestly, at this point I'd rather eat him, but my character's vegetarian, so...

I'm sure I could turn the horses carnivore, though. That'd certainly help keeping them fed.

I don't joke about it, but if they end up dead... Dead is dead, and meat is meat. Give them their rites, and the flesh is left to sustain the living.
Granted, in many settings "dead is dead" isn't so much the case.

It wasn't owned by a party member, but when one of my players fried a Snover with a fire attack in my Pokemon campaign, he decided to immediately attempt to eat it. I was irritated at this decision, but to try and keep things fun, I decided it tasted like a christmas fruitcake. Unfortunately, this only made him curious about other things, and we had to add "eating Pokemon" to the list of things he is not allowed to do.