Here's the intro for the song Acapella by Karmin. Tabbed by ear, so it might be off, but 
this is how I like to play it. Its a fun, easy riff to learn and a good song.

Intro

e|----------------------------------|
b|----------------------------------|
G|----------------------------------|
E|---7-7-5--------------------------|
A|---------7-7-3-5-5-3-0-0----------|
E|----------------------------------|