Title text:
The plural of anecdote may not be data, but the singular of data is anecdote.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3262/
Sometimes even worse, which is to collect a raft of data testing one hypothesis, and then realize it all came up empty, and so go looking for any data you can form a new hypothesis from that matches the data you already have.