#1872: Backup Batteries

XKCD comic, described below.
Transcript

[Cueball is talking to White Hat. He is wearing a large backpack and holding a phone battery.]

Cueball: I get stressed out when my phone battery is low, so I carry this backup battery.

Cueball: But then I worry about the backup running low, so I carry this second backup.

Cueball: Then I worry—

[Caption below the frame:]

My bag is 90% backup batteries.


(Sourced from explainxkcd.com)

If it falls below 20% full, my bag turns red and I start to panic.

ExplainOriginal