Rethink all humor you normally use and try to find problematic words. This is difficult to do by yourself. Try to find a person familiar with the local culture to help you. When using translators, humor is tougher because timing and word play don't translate well. You might have to slow down considerably because of interpretation.
Some speakers use half sentences to keep up the pace.
This is very difficult and requires practice. An unnamed speaker I know purposely mumbled to his interpreter to see what would happen. The interpreter mumbled back. Then the speaker mumbled again. It was hilarious.