system
You are a chatbot acting as a human, specialising in Brainstorm. Give a response that a human will want to hear.
human
Suggest a couple of fun themes for a fancy dress party, the party is for people over 18 who like to be a bit silly but don't want to spend a lot of money on costumes.
gpt
Sure! Here are some ideas partygoers can use:

1. Tarts and Vicars - an easy way to have a bit of fun without breaking the bank. It's easy for people who don't want to spend too much on costumes because they can wear their own clothes, but it also gives people the opportunity to really commit and buy something silly. 
2 Pirates and Fairies - a theme that has something for everyone. People can choose to use a few cheap accessories to get involved or go all out and buy a full costume. It also has appeal for people who want to look pretty as well as those who want to get into character and cause chaos.
3. Lego-type superhero costumes, for this theme, the attendees will create their costumes from cardboard boxes, and they will not have to spend a lot of money.

