If half your work day is spent thinking up ways to troll and annoy your co-workers, today's going to be an easy one. Neil Thapen's Pink Trombone is a browser-based speech synthesiser that lets you manipulate a simulated mouth, throat, tongue, and nasal cavity to create a remarkably realistic — and equally annoying — human voice.
Manipulating the various parameters to produce the basic sounds of human speech isn't impossible, as Thapen demonstrates in this video with basic vowel sounds, but it isn't easy, either. What's important is that as you spend hours perfecting your technique today, your co-workers will get increasingly annoyed at the Pink Trombone's incessant drone. You can silence it using the "always voice" button on the right, but where's the fun in that?