Keith Collins, for Quartz, rounds up some hilariously bad ways we could ask users to enter a phone number on the web. It all started with this (unverified whether it's "real" or not):

What we have here is a dystopian vision of what the internet might look like if web developers suddenly stopped caring about user-friendliness.

You gotta go check out the post because there are some absolutely whack and super funny entry methods that were only posted as GIFs. A bunch were created on CodePen though!

See the Pen Phone number selector by Cherie Yang (@cheryllium) on CodePen.

See the Pen BKvGRd by Andrew (@ACreativeCodePenID) on CodePen.

See the Pen Best phone number form by Chris Coyier (@chriscoyier) on CodePen.

Somehow Jake's was missing:

See the Pen CSS: `checkbox` Phone Number Input by Jake Albaugh (@jakealbaugh) on CodePen.