Whats the stupidest argument you've ever had?

[Deffeh]

For me, i think it has to have been a time last year when i was relaxing with a few beers in my room with a couple of pals. We were discussing the usual bollocks, politics and all that. To cut a long story brutally short; one of my friends stormed out the room and the flat, and overturned all the wheelie bins on the high street on his way home, because..

.. i said i dont believe in the worth of the Space program.

what? Anyway, whats the most ridiculous petty argument you've ever had.