In anticipation of the new Arena documentary about the London Underground - and an entire night of classic Tube programmes on BBC Four - we're looking for your weird and wonderful experiences of using the Underground.

Have you had any strange or exciting adventures beneath the streets of the capital? Perhaps you've explored one of the 'ghost' stations, or maybe you've been amazed by a bizarre coincidence caused by the fact that millions of people are thrown together every day on the Tube.

Send in your Tube memories and we will publish a selection on the website. Find out what other people have been saying here.