The past year was not without its major tech disasters. And the Telegraph newspaper wasn’t shy about trumpeting them. In its year-end look into the biggest tech failures of 2013, the Telegraph focused on three miscues that really showed how tech can backfire when it’s not properly tested or monitored.

The healthcare fiasco

Pres. Obama fought to get the Affordable Care Act enacted. Then when it was time to roll out the Healthcare.gov website that was to be the online home of the new insurance plan, he and his fellow White House staffers stumbled big time: The site was a catastrophe. It rarely even loaded. And if consumers were lucky enough to login, they struggled finding insurance information they wanted. The site has been largely fixed since then, but the fiasco has still left a stain on Obama’s legacy.

Sabre’s travel mess-up

Online booking giant Sabre created huge problems for travelers in 2013 at the height of the student vacation season. Sabre went offline for only three hours. However when it did, it contributed to countless flight cancellations and delays for thousands and thousands of passengers. This isn’t a surprise: Over 300 airlines rely upon Sabre.

Walmart’s “bargain”

In October, consumers shopping Walmart’s website thought they’d found a fantastic bargain when they managed to purchased computer monitors and other gear for just $8.99, despite the fact that these tech items were regularly priced up to $500. Walmart blamed tech glitches and refused to honor the bargain deals. Naturally customers were angry. And if you wanted proof, you just needed to log on to social media.