"Mmm... If you want to vibrate through walls? I've got something better than a caffeine bomb. It takes afew minutes, but it's worth the wait..."
She grinned, and stepped over to the coffee machines, humming happily as she turned the water line off of one of the machines, adding water from a bottle into the well reservoir. While the water heated, she packed two filters with coffee, loading one into the machine, then pulled two shots of espresso, immediately loading the other basket and pulling another two. All four shots were added to a large cup, the entire concoction topped off with drip coffee. She added a lid, then handed it over to her customer.
"That... is a nuclear caffeine bomb. Guaranteed to give you the jitters, unless you're a hardcore addict."