About 30 seconds but I cheated because I copied it locally and twigged when nothing would run: http://www.mikefranklin.me.uk/experiments/oneplusone/text/javascript

The parentheses enclosing the sum are taken into account in the in the evaluation, and while 1+1==2, (1+1)!=2.

Or not, possibly

1+1= 3 metre piss. It's a talent you'll need to learn if you want to be able to code and not use up time for bathroom stops.

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