This one might not be a joke. Tech titans have made legislators look clueless in previous encounters, but when the CEOs of Amazon, Apple, Google and Facebook face the House Antitrust Subcommittee today, it may be different. The panel has reportedly done its homework, spending a year probing the companies’ allegedly anti-competitive practices, like using their control of digital devices and access to overwhelm developing businesses. It has also compiled 1.3 million documents and scrutinized the executives’ previous statements. But people like Amazon’s Jeff Bezos — the world’s richest human — aren’t likely to come unprepared, either.