Light Amplification by Stimulated Emission of Radiation. Laser.
Self-Contained Underwater Breathing Apparatus. Scuba.
Radio Detection And Ranging. Radar (don't know why 'and' is part of this one but whatever)
Thomas A.'s Swift Electric Rifle. Taser (I'm never getting over the fact taht that's its name)
Completely Automated Public Turing Test to Tell Computers and Humans Apart. Captcha (Well technically captttcha)
Graphics Interchange Format. Gif (and it's pronounced "giff" people, it isn't peanut butter, I will fight anyone on that, even the people who invented gifs)
Zone Improvement Plan. Zip- as in zip code