I don't remember. My sense is I have seen it a lot. 

https://imgprxy.stacker.news/0bOjUC_KIE9KnXQXO6z_ahdSTTONmWceFmYTYd3_EGc/rs:fit:600:500:0/g:no/aHR0cHM6Ly9jZG4ubm9zdHIuYnVpbGQvaS9hNGEyN2RlZTllZmMxNjM0YzYzNWYxOTk4MzVjN2E4ZWE0YzY1NWM2ZjM3OGNjOTIzYjAxNmUxNTlhYjNjMTI0LnBuZw

This comment has the oldest mention of it I could find: https://www.reddit.com/r/Bitcoin/comments/s0lrl4/if_you_cant_keep_bitcoin_while_its_down_80_you/hs30m6i/

BTW from where did you heard it?

sahil

Of course I didn't invent it. It's a classic. Does anyone know who first said it?