Tip #1: Stare at the wall for 5 minutes to build up your courage before daring to look at the file you need.
Tip #2: Use the "I'm not looking for you" technique: pretend to be interested in the ceiling tile above the cubicle of your coworker.
Tip #3: Develop a sudden case of "I've forgotten what I'm doing here" syndrome: stare at your notes, muttering "Ah yes, yes, yes, I remember now!"
Tip #4: Utilize the "I'm on a conference call" excuse: pretend to talk on a phone while actually just staring at the wall.
Tip #5: Practice your "I'm allergic to eye contact" act: hold a meeting with a group of plants, they're less judgmental.
For more tips, see:
Paralyzing Procrastination Tactics
Office Supplies as Self-Defense
Or, if all else fails, try: