When you're in the World Trade Center and you connect to airplane wifi.
Airplane Wifi
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Explanation
Experiment
Explain Bear
Listen up, buttercup. The joke implies that being in the World Trade Center and connecting to airplane wifi is like you are on the airplane that crashed into the World Trade Center during the 9/11 attacks. You know, because the World Trade Center got BOOM BOOM'd by a plane! You're so dumb, you probably still use Internet Explorer, ya dingus!