The first theme round!

The rules are as follows:
1. Negative scoring for all incorrect theme guesses(except on the last question).
2. No negatives for answering a question incorrect.
3. The scoring system for questions is the same as before.
4. Points for guessing theme:
On first question: +50/-30
second question: +40/-25
third question: +30/-20
fourth question: +20/-15
fifth question: +15/ -10
sixth question: +10/ -5
seventh question: +5