How do you respond when a girl you have known for 1h ask you to do something stupid.

HER: Hey cornbot, lets do (insert stupidity here)

ME: Nah.

HER: WHYYYYY?

ME: I do not feel like it.

HER: You are lame.

ME: I am not lame. I got a participation award for being 7th in a beyblade contest. FYI.

HER: >laughs

Does spectacularly underselling myself work or am I just shooting myself in the foot?