delete_heard_timeline_event(current_user.id, @showable_video.user.id, @showable_video.video.id)

def delete_heard_timeline_event(actor_id, subject_id, secondary_subject_id)
      TimelineEvent.find_by_actor_id_and_subject_id_and_secondary_subject_id_and_event_type(actor_id, subject_id, secondary_subject_id, 'heard_event').destroy
  end

a = YourModelName.new
a.delete_heard_timeline_event(your_parameters)

YourModelName.delete_heard_timeline_event(your_parameters)

find_by_actor_id_and_subject_id_and_secondary_subject_id_and_event_type

class TimelineEvent
  def self.delete_heard_event(actor_id, subject_id, sec_id)
    self.scoped.where(:actor_id => actor_id,
     :subject_id => subject_id,
     :secondary_subject_id => sec_id,
     :event_type => 'heard_event').first.try(:destroy)
  end
end

TimelineEvent.delete_heard_event(current_user.id, @showable_video.user.id, @showable_video.video.id)