Liam is on the 66 bus when a woman tries to get on in Coolidge Corner with an SUV-sized baby stroller:

... I wavered between who I found more annoying: the woman who brought a ginormous stroller on public transportation or the passengers who steadfastly refused to let her in thus creating a dangerous bottleneck. Luckily, after a few stops things cleared up and the woman with the stroller moved over to the handicap seats, flipped them up and stood with the stroller out of the way. This was a good thing because as we passed through Allston we picked up more and more passengers until people were squished in like sardines. Altogether and ugly and unpleasant ride. ...