[jessaustin]

There are few fruits that vary so much in size and shape as does the banana. Has anyone actually suggested using that as a standard for anything?

[DanBC]

Some online communities use "banana for scale".

Other communities talk about radiation risk in terms of radiotion you get from a banana.

It's about as useful as double-decker buses or football fields.

[bitJericho]

The banana used for such measurements is your typical grocery store banana.

[DonHopkins]

I hear well made bananas are also useful for terrorizing atheists. [1] Something about how they don't squirt in your face.

[1] https://www.youtube.com/watch?v=2z-OLG0KyR4