Historical clue formulations

• "u r freaking hilarious!" — 2025-08-15
• Duo with the 2011 #1 hit "Party Rock Anthem" — 2023-12-21
• "That was hilarious!," in textspeak — 2023-11-12
• Electronic dance music duo that performed at the 2012 Super Bowl halftime show — 2022-10-19