The start of a civil engineer?

 I was offered a quite staggering number of cardboard tubes to use at Rangers (aka someone wanted their garage emptying of them!)

Never one to say no I filled my car and HWMBOs car with them and then came up with a plan.

 Marble run on a large scale!

A few rolls of duck (duct - you say potato I say potarto) tape later  and it was snaking it's way all around the building where we meet.

 Ping pong balls were put into play.

And we had a night filled.

There is a civil engineer challenge badge and whilst build a marble run isn't on the criteria for earning the badge, I always feel these things should be flexible....

especially when I have no desire to have a garage full of cardboard tubes either!