Factors on being great at this:
1.) Several applied in succession, sequenced with completely unpredictable timing
2.) Verbal game from the 'ler, ideally in the form of questions that get the 'lee to begin an answer that just so happens to coincide with the next installment
3.) Applied at different spots, and for bonus points, a live analysis or Q&A comparing the 'lee's reaction to this spot vs. that spot