Open a new tab in your browser, but not for actual work. Type in some random words, like "The Art of Making Your Boss Think You're Doing Something" and hit search. Make sure your boss sees you typing.
Link to Step 1: Pretend You're Not Browsing Cat Videos for more tips!
Link to Example of Actual Work Being Done in 10-Minute Blocks
Or, if you want more of the same, check out Advanced Xero Copy Techniques