How to Tell if Someone's Been in Your Room

Here's a Quick and Easy Way I Made Up To Tell If Someone's Been in Your Unlocked Room --

1. Get Yourself an Empty Aluminum Soda/Beer Can

2. From the Outside of Your Door, Close it Almost All The Way

3. Reach Inside Your Room and Place the Can on the Other Side of the Door, So That the Can Will Roll When Someone Opens the Door

4. From Here You Can Close Your Door or Leave it Cracked Open A Bit.

---- 5. When You Return Later, Open Your Door Just Enough to Let Yourself Get Inside, so as to NOT Open it so much that it rolls the can as much as the ordinary trespasser would.

6. If the Can Has Rolled Far Enough that Someone Must Have Opened the Door to Make it Do So, Someone Has Been in Your Room