Chris

Not sure if this is what you have in mind, but I think the HSE did a number of workshops on the topic of slips and floor coverings - as part of this they demonstrated how the friction associated with certain floor coverings changed with the addition of water.

I have seen others do this too - taking a number of floor tiles of different materials (scraps from local floor coverings shop) and putting a block of smooth wood on each tile, set at a fixed angle - then when dampened with water some of the tiles could no longer support the wooden block without it slipping. Making the point that some floor coverings loose more friction than others when wet.

I guess you could build a demonstration around this type of thing, using other liquids that might contaminate the floor of the company for which you have the interview (say foodstuffs (cooking oil) if they make food!) - This could demonstrate the importance of floor material choice in the prevention of slips!

Hope this a starter for 10, and someone else can build on this one for you

best of luck

Stuart

PS let us know what you decide to go with!