Cloth office chairs, when thoroughly saturated with water over their whole surface, are impossible to spot. They are just a different shade of brown or whatever.
When your intended victim sits down, they don't notice...for the first five seconds or so...the length of time it takes for the H2O to soak through their pants!
Hilarious!
This only works on female employees but if you can sneak
in and stretch Saran wrap very tightly across the bowl of
a toilet, it becomes invisible and rather like a water trampolin if you know what I mean.
When I was in Nam one of our hoochmates was a real mooch
and would always importune anyone going to the mess hall
to "bring him back a sandwich". It used to drive us crazy.
One day, this happened and when we went to the mess, another
friend was on KP so we talked to him at the scullery for a few minutes after lunch.
We notices a dead mouse by the door so got two pieces of bread and tucking his tail neatly around him made a "sandwich" for the hungry victim.
When we got back, he was asleep on his cot so we placed the sandwich next to him and waited for the supreme moment.
Sure enough, he woke up, stretched, saw the sandwich, grabbed it and took a big bite! Missing the mouse completely, but it's tail fell out from between the bread
right where he had bitten, he screamed and went running
and gagging out of the hut. We were in hysterics for days.
Please note this was the same guy who drank a whole fifth
of Vietnamese whiskey, Silver Fox or Berkley's I think,
then passed out on his cot and proceeded to vacate his bowels all over. Not much of a partyer but a real party
POOPER.