Because, honestly, sometimes words are all that's left when your arguments are as weak as your Wi-Fi signal.
Or, you know, maybe it's just a sign that you're trying too hard to sound clever but really you're just eating a whole pizza by yourself in bed.
Read more about when sarcasm is just a joke.
When sarcasm is just a justification for my existence.
And, of course, when sarcasm is the last resort, aka my social life.