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Telling someone your taking them out and changing your mind last minute,
I told the misses I was going to take her for a nice meal on her birthday for months but I don't fancy it so I'm pulling a Corbyn and staying in instead.
Going into a task with unwarranted confidence and bravado and falling flat on your face.
"I can build this ikea wardrobe in a hour" 4 hours later as you have a mental breakdown you think to yourself "Im pulling a Corbyn, should have just paid for the assembly service".