Regardless of experience points, you may only level up...

1. Dancing on a rooftop
2. Holding a bouquet of at least seven different flowers (and then tasting a petal of each)
3. Riding a winged evil, holding on to its ears
4. Failing a jump across a great chasm
5. Starting a false rumour, and be able to hear again from someone else
6. Circling a goblin three times
7. Making a public announcement that discredits you in a town square 
8. Crawling under a pig twice
9. Singing in a prison cell
10. During a siege
11. Steal something and return it the next day - unnoticed
12. Successfully impersonating a noble person and fooling at least two