Depends on who is making that joke. If it is my boss, I might laugh. If it is a friend I will tell him it's not funny
I will not pretend it's funny and laugh, but i'll probably keep silent and not said something like "this isn't fnny".
i pretend to laugh
I'd awkwardly stare and turn away.
I'll smile or say "Hmm." Because fake laughs make me want to hit the person with a sledgehammer.
If it's a crude/rude joke, I usually don't even pretend to laugh at it.
I show that it's not funny. I'm not afraid to laugh at something I think is funny that no one else thinks is funny either :D
Look at them like 😐😕
fake a laugh but don't bother to try too hard. If it really sucked tell them "that joke sucked: :)
i'll do a small chuckle and smile