- When your favorite sports team wins. Or heads to the postseason: GO GIANTS!
- To accentuate ONE word in a sentence, especially on Twitter or another occasion where italics are unavailable: Are you kidding me? Double Rainbow is the BEST viral video ever.
- Any reference to major WIN or FAIL: That bird video on PetSugar was a huge WIN.
- Three-letter abbreviations: OMG, WTF, FML, etc: OMG how is it possible that Lindsay Lohan is headed to court again?
See the rest of my acceptable caps lock situations AFTER THE BREAK.