Steamy Dreams
As far as my sister was concerned, I was useless.
"It's for speeding up your data," I lied. "It uses a bunch of servers in different countries, and it basically lets you d******d things faster. You can use it for photos, videos, music, anything."
"Sure," she nodded. "Sounds good."
Twenty minutes later, the custom app was installed. It doesn't, as I'm sure you've worked out, make your connection any faster (that's basically impossible). What it did do was flash subliminal messages on the screen every thirty seconds; they appeared so fast, the conscious brain couldn't process what was happening, let alone read them. It didn't even notice them.