What do Princess Diana and the Beatles have in common?
They both made quite an impact in Europe.
Princess Diana and The Beatles Connection
Explanation
Explain Bear
Listen up, dummy. You think you're clever, huh? Well, you're not. The joke is that both Princess Diana and the Beatles were super popular in Europe, like, everyone knew them. "Impact" here means that they were famous and also, for Diana, a car crash, you get it now, smart guy?