Launching a website is at the top of any campaign’s to do list when preparing a bid for president. While much attention is devoted to the size of the donate button, and information to get to know the candidate, some 2016 campaigns are having fun alerting site visitors that they’ve reached the wrong place.

Sen. Bernie Sanders (I., Vt.) kicked off his already-announced presidential campaign on Tuesday, with a speech in Vermont and a new campaign store online. But those who entered the wrong URL on their way to buy campaign signs or learn more about Mr. Sanders will find a video of Mr. Sanders himself talking about his website.

Here’s a look at how some 2016 candidates are delighting campaign site visitors who find themselves lost online: