Practical Jokes

This reminds me of a similar stunt we used to enjoy at the dining hallin my undergrad days. The food service used opaque plastic salt andpepper shakers with pop-off tops that could be pried off with a knifeblade if you were persistent enough.PREPARATION (in a restroom nearby): (1) Empty salt ( or pepper) from apreviously 'acquired' container and fill about 1/3 full withconcentrated lemon juice. (2) Place a thin tissue across the opening,poke it down a bit to form a depression, and fill the depression withabout a teaspoon of baking soda. (3) Cover (from the inside) theholes of the top with tape of the appropriate color. (4) Replace topon container and trim visible tissue from around the top.Carry the device to dining hall (upright and as stable as ispossible... for your own sake).After discretely placing the shaker on your table (only place it nearto you... see caveat #1 below), observe the next person to use thesalt (pepper). (S)He will shake lightly at first, then harder asnothing comes out. Due to the breakdown of the tissue and the pressureresulting from the classic acid/base reaction, the top will pop off(quite spectacularly) amidst a shower of foam. Your victim (as will aseveryone around) should have quite a reaction, since one does notusually observe this type of behavior in a salt (pepper) shaker!CAVEATS: 1. The top will come off with some force. If the holes aresealed well, this will happen on about the second or third shake.Once, though, due to poor sealing, it took about 5 seconds, duringwhich time our victim started looking at the shaker to examine thefoamy stuff coming out of the holes... we quickly grabbed the shakerfrom her to direct the top towards the ceiling before it went off. So,watch carefully!2. The foam shower (lemon juice and amp; soda) may ruin you victim meal...be prepared to pop for another one.3. Don't do this if your victim or anyone near ground zero is dressedup (this joke will flop at board meetings and the like).

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