There's the option of saying: 'It's the internet. What do you expect?" There's also the classic "Your face!" and of course, the ever so beloved, "Yo momma!"
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5 Million Pairs of Boxers: $200,000
Manpower to soil said Boxers: $50,000,000
Interplanetary Cannons: $900,000,000,000
Traumatizing an entire alien race: PRICELESS.