A door is not a replacement for a ladder. Repeat it with me.
Talk about a makeshift ladder!
It should go without saying... DO NOT STACK LADDERS!
Key h&s statistics from the construction industry. See http://www.hse.gov.uk/construction/campaigns/safersites/?ebul=pinterest for more on HSE's Safersites Initiative
Key findings for the Construction initiative. http://www.hse.gov.uk/Construction/campaigns/safersites/index.htm