1) Karen always seemed to be the killjoy at parties, constantly complaining about the music and not joining in on the fun.

2) No one liked inviting Jake to movie nights because he was such a killjoy, always critiquing every film.

3) The teacher's strict rules made her a killjoy in the eyes of her students.

4) Don't be a killjoy, just let loose and have a good time!

5) Despite his best efforts to be positive, Simon couldn't help but feel like a killjoy when his friends discussed their exciting plans.

6) Sarah's constant pessimism and negativity earned her the nickname of the group's killjoy.

7) The fun-loving group quickly learned to exclude Mark from their outings, as he always turned into a killjoy when things got too lively.

8) The enjoyment of the outdoor concert was dampened by the killjoy neighbor who called the police to complain about the noise.

9) When everyone was eager to try a new adventurous activity, Emma was the lone killjoy who stayed behind.

10) The office environment felt stifled by the presence of a killjoy manager who frowned upon any laughter or jokes among the staff.

11) Sorry, but I can't provide that.