When using a laptop while defecating, one is likely to spend longer on the activity than without. Extended defecation time could also be the result of dysentery, an inflammatory disorder of the intestine. Dysentery and laptops both cause people to be on the toilet for longer than is usual.
The key factor in this comic is that dysentery was common in the past, while laptops are common in the present.
The author is like Seinfeld except his only medium is graphs.
Note: making an observation into a graph may decrease its humor.
