Popping Balloons. Try this one...

Whilst the average popping balloon sends most of us into an array of frantic panic the balloon which is popped by a hoover is something you have got to hear. It may make you run for the hills and take cover, but the extreme bursting and then suction of the hoover causes an almighty bang. I urge you to be try this out, do it safely and not in front of your elderly Grandma though. I recommend experimenting this in a room with closed doors with a slight echo, give it a film and let me know how you get on.