Quite right - I will always listen to cabin crew, however 'silly' it might seem. After all their asses are in that aluminium tube as well as mine! On occasions they hear something 'strange' during taxi-out or take-off and if I don't have a logical answer then I consider it worthwhile further investigation.
I recall an incident where fuel was pouring from a vent on the wing, spotted by cabin crew and subsequently returning to stand uncovered two faults in the plumbing that might not have been picked up for some time. Not life threatening I know, but may have led to arriving with a lot less fuel than expected. (I'm sure our switched on F/E would have spotted the increased fuel consumption in flight)
Cabin crew are an invaluable part of the crew and anyone who thinks less of them should re-think their position.
Rgds
CL747