found two versions:

Poor Old Man
(Trad)
(as sung by Iain MacKintosh)
Scotland

A poor old man was crossing the road
Crossing the road, crossing the road
A poor old man was crossing the road
When along came a wheelbarrow

Don't let the wheels of your wheelbarrow
Your wheelbarrow, your wheelbarrow
Don't let the wheels of your wheelbarrow
Run over the poor old man

A poor old man was crossing the road
Crossing the road, crossing the road
A poor old man was crossing the road
When along came a fish and chip potato van

Don't let the wheels of
Your fish and chip potato van, wheelbarrow (3x)
Don't let the wheels of
Your fish and chip potato van, wheelbarrow
Run over the poor old man

A poor old man was crossing the road
Crossing the road, crossing the road
A poor old man was crossing the road
When along came a trolley bus wi' nae wipers

Don't let the wheels of
Your trolley bus wi' nae wipers, fish and chip potato van, wheelbarrow (3x)
Don't let the wheels of
Your trolley bus wi' nae wipers
Fish and chip potato van
Wheelbarrow
Run over the poor old man

A poor old man was crossing the road
Crossing the road, crossing the road
A poor old man was crossing the road
When along came a Glasgow Corporation cart that sooks water oot o' holes

Don't let the wheels of
Your Glasgow Corporation cart that sooks water oot o' holes
trolley bus wi' nae wipers, fish and chip potato van, wheelbarrow (3x)
Your Glasgow Corporation cart that sooks water oot o' holes
Trolley bus wi' nae wipers
Fish and chip potato van
Wheelbarrow
Run over the poor old man


From a Boy Scout songbook
MY POOR OLD MAN WAS CROSSING THE ROAD

My poor old man was crossing the road, crossing the road, crossing the road
My poor old man was crossing the road
When along came a bicycle wheel (draw circle in the air)
Oh don't let the wheel of my bike
oh don't let the wheel of my bike
oh don't let the wheel of my bike
Run over my poor old man

Double decker bus (hand flat face down one above the other moving alternately)

Fish and chip van (mime eating)