From a report on a taxying incident :
"...The first officer suffered a fractured arm and leg when the aluminium stairs were blown over by the force of the Qantas jumbo's engine blast. The 747 had been taxi-ing to a runway and was awaiting clearance from air traffic controllers to take off when the incident occurred.
The Qantas jumbo QF8 had stopped over in Brisbane to offload passengers while on its way to its final destination of Sydney. The jumbo's engines have stronger thrust than other aircraft because it is used to fly one of the longest routes in the world between Australia and Dallas, Texas"
You learn something every day 
Spot on Garry, but particularly if you run out of fuel.