Ignore it. It is not your responsibility to help keep the teaching spaces safe.

Write a sign to keep people away from the hazard and try and fix the hazard, as it is everyone's responsibility to contribute to safety.

Not disrupt the class. Notify a staff member at the end of the session.

Stay away from the hazard, warn others in the immediate vicinity and report it to a member of staff as soon as possible.

Your TA will laugh and appreciate the additional source of entertainment.

Your TA will ignore your unsafe behaviour.

Your TA will warn you to stop behaving in an unsafe manner, and ask you to leave the class if you persist.