So try this: make up a swear word.
It's a great exercise alone or as a group. Solo effort or collaboration; it'll offend everyone in principle and almost no one in execution.
1 - determine the priniciples of a good swear word - 5- 15 min.
- Sounds - sibilance? hard constanants?
- Nonsense or parts of real words?
2 - using your principles, create 2-3 new swear words 15 - 30 min
3 - put them in a sentence
4 - use it in public once - with a friend, co-worker or (my favourite) sotto voce in a store as you check your smartphone.
Just 20 - 45 minutes and you will find yourself recharged, laughing and ready to tackle the day.