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The chap who ran the facility had a party piece. He'd put bird seed on top of the blast wall in front of the inlet. He waited for enough pigeons to start eating the seed. Then switched on the engine. There were a lot of feathers...
Petty Officer JD Bridges on a US Navy aircraft carrier got sucked into the intake of a fighter jet. Somehow his body got wedged in such a way that he did not go through the engine and managed to climb out a few seconds later.
Video of the incident in question, also an interview with him the next day: https://www.youtube.com/watch?v=GF3Iz7b95-8&t=46s
Which is one rapid method of equalising pressure at the intake and exhaust.