'Field Trip' was a solid example of classic 'How I Met Your Mother' (Mon., 8PM ET on CBS) comedy. There were multiple storylines weaving through one another, each revealing bits about our characters and most importantly, progressing things in their lives.
Let's face it, we like the idea of change and growth on 'HIMYM.' It is, after all, supposed to be the story of how Ted found the woman he would later marry. Thus, we are inherently watching these people grow up and make big changes in their lives.