Some people love garlic and some people hate it. With this simple technique you can convert an ordinary candle into a garlic scented one instantly. What better way to do a scientific garlic tolerance experiment at a party.
Garlic oil is easiest to find in health food shops in the form of gel capsules. I got mine at Holland and Barrett, but even dollar store type shops sell them, and often at the same strength. Ignore the 1000mg bit of Holland and Barretts packaging. In the small print on the back it concedes that it's actually only 2mg of concentrated garlic oil in 998mg of soya bean oil!
You can conceal a capsule or two in your pocket and then surreptitiously nip the end of one with your teeth (you only need to pierce it) and then squeeze the stinky garlic oil out into the melted pool of wax in a nearby candle. In due course a strong garlic aroma will permeate the room.
This technique can also be used by garlic lovers to convert ordinary tea lights into savoury smelling garlic ones.
I strongly advise against doing this at vampire parties as it tends to spoil the night a bit.