This is a great prank to play on a housemate or family member. It involves modifying a shampoo bottle so that when squeezed the top will pop off and spurt a shampoo substitute all over them and the shower (we wouldn't want to waste their expensive shampoo now would we!).

This prank will aggravate them four-fold. Firstly, their shampoo bottle will appear blocked, causing them to squeeze it harder. Secondly, it will explode 'shampoo' (actually cornflour and water) all over them. Thirdly, if you carry it off well, they will think they wasted all their shampoo. Especially annoying since shampoo is so expensive! Lastly, if they don't notice it's not quite its normal consistency, they might rub it in their hair!

Tools Required:

  • sharp knife
  • glue gun
  • mixing bowl
  • funnel

Materials Required:

  • empty shampoo/conditioner bottle (must be opaque)
  • cornflour
  • water
  • food colouring (optional)

I've included a PDF of this instructable in the last step as pictures are quite useful in this instructable.

Step 1: Which bottle to choose?

You will need a bottle that's opaque (not see through) so that your victim cannot see the slightly different coloured goo in the bottle. My housemates always use the same shampoo so I can easily nab one of their empty bottles from the recycling to modify then switch it for their almost full one when they're out.

Once you've picked your bottle, rinse out the bottle, being careful not to wash off the dried shampoo from underneath the cap. Making the bottle too clean will give the game away!
What if I used mayonnaise instead of water and cornstarch?
Clever, feller! I like pranks that aren't mean, and this is really great!
Thanks for the feature :) I'd forgotten I'd written this one it's been so long!
do you need to do this with a lynx bottle?
Nope. Pretty much any opaque bottle will work. Step 1 details what's good and what's not.
so you dont have to trim the ring of plastic?
Oh sorry. I didn't realise you're written this in this step. I thought it was a comment about the ible in general. Yes, with a lynx bottle you have to carve a bit of the lip away. I looked at the one we have and it's very similar to the one on the herbal essences bottle I used.
yah i didnt know it had the lip but when i played with my bottl the cap thing came off
Or, pour diet coke in there, put a mentos on a STRING, cap it in there and boom.
Don;t think that would work because they react right away...you'd prank yourself instread of somebody else! lol
Do you mean like the instructable already on here
i just thought of that. And got done watching a coke bottle prank.
i think she stole it
they are all rigged to blow
Nope! Those were the full ones from our bathroom that I used as a demo of what bottles would be good to use and which wouldn't work.
Hahaha nice, i wont ask for pictures of the prank in action, showering=nsfw :P<br/>
Ha ha. Yes, I thought to put a warning about that :p
You () - good prank. L
I () ?
(Insert words that people call you when you prank them with this) L
i was thinking it would get all over the ceiling, but the bottle would be upside down when they squeeze it. Nice and easy prank

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