FedEx

A year or so ago I was at an event where a speaker showed us at the start of his talk the FedEx logo and said that every time we looked at it again we would remember him.
I wasn't sure what he was on about until the end when he showed it again and pointed out the arrow in the logo.
I expect everyone knows about this except most of the people present at the event didn't.
But I'd never noticed it before and I'll always remember him, shame I forgot his name...