I, myself, have an office that is appointed like the bridge of the Enterprise and I expect that my students may have similar appointments with multiple monitors, televisions, game-gear etc. which provides numerous distractions.
To that end, I nearly always engage with attention getting dialogue/questions that elicit a, "wait...WHAT?" response.
My goal is to get the student to become much more interested and involved in the subject matter and engage with not only myself but their classmates as well.