There are many logical options, you could:
1. Wait until you get home and dump it down the sink.
2. Find a nearby garbage can and throw it in there.
3. Give your remaining drink to someone else.
4. Just drink it anyways.
or
5. Dump (what looked like at least half ) your drink out your window onto the road..... and receive the biggest D-bag ever award just like the the Gray Ford Explorer in Orem, Utah on Nov. 9, 2011.
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That's right, I'm calling you out. You disgust me.