Which chemicals could do this?

Take a look at this thread: http://www.scienceforums.net/forum/showthread.php?p=435357#post435357

In particular, take a look at the video link in the OP of a magician. At 11:50, Keith Barry stages a trick using a volunteer from the audience, a shard of glass and a coke bottle (if you don't want to watch his other cool illusions, you can just forward to 11:50 on the video). The trick climaxes at 14:00 with the shattering of the base of the bottle using only the shard of glass and the negative emotions of the volunteer, supposedly.

I think it's done with chemicals, one he slips into the bottle and the other present on the shard. At 14:00, you can see liquid when the base shatters, and the reaction probably doesn't start until the volunteer shakes the bottle. Which chemicals would fit the bill here? Both need to be colorless, low odor, when mixed in small quantities causes an exothermic reaction capable of heating up thick glass very quickly, causing it to shatter due to expansion.

If you have any ideas, post them in the other thread. I'll close this thread to avoid double replies. Thanks!