I had a minor security anomoly recently
Returning to LHR from yon I had two tiny pots of honey which weighed 125 Grammes each. They were confiscated (very charmingly I have to add by the very cute young lady from security even though they are actually only 87ml of liquid and I thought the rule was no liquids over 100ml not 100g.
My french isnt up to specific gravity issues but again it shows its all a pretty random process. It will be interesting to see what these Aussie nutters looking to gas people on a plane were planning to use and if that will impinge the 100ml rule