Here is a slight ripple effect when the 15+ minute late 121 and on time bus to the same general location causes.
Normally this bus is pretty empty since the 120, 121, 122, and 123 all serve to Burien Transit Center. I got on at 3rd and Pike (thankfully) and the bus very quickly filled up to at least 28 people standees.
I do want to give major kudos for the bus driver who totally kept her cool and kept the ride smooth as glass. Excellent throttle and braking control, especially for a fairly new driver! Way to go!