totally speculating here, so i could be totally wrong and your house could explode tomorrow in a big cloud of mercury vapor....
i do not see any reason at all why CFL bulbs touching would be dangerous... unless they get hot spots and shatter. they are just glass with gas inside that has electricity passing through it.
again though, that is just the opinion of some stoned fucker on the internet

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wait, let me get this straight... if you fry an egg you can get fucked up?

dissent is the highest form of patriotism