Clark's law states; "Any sufficiently advanced technology is indistinguishable from magic." Can you think of something we now consider commonplace that would have seemed like magic only fifty years ago?

Instantaneous, real time worldwide communication via satellite AND access to most every byte of human knowledge, on a portable device in everyone's hand; soon to be wired directly to the cortex. 

Having "incomparable recall of those times" (his words), my 81 yr old father-in-law (still lucid and pushy) nominates these:

Big screen 4K TV's 

Cars parking themselves

The Cloud

Bluetooth

CGI 

Flashdrives

I kid him, but the old guy is a gem. -Z

Answering Machines

Pagers

Nano Micro chips

desktop and laptop computers

Online everything

It's a quotation I used often when explaining my company's products.

The example I'd now give would be about  how we completely missed the rate of development of technology.

Star Trek had "communicators". Feeble kit when compared with a modern smartphone.

Cell phones
Home computers
WWW
Microwave ovens
LED lights
And, of course, the magic that went horribly wrong:

Combs that bend water