Following on from the jumping Tubercle bacilli, I would like to share with you the situation I find when doing a locum some 15 years ago in Papworth hospital, Cambs, England.
Papworth is one of 2 highly prestigious heart/lung transplant hospitals in UK.
It's a funny place, with proper buildings, some quite old, and modern extensions which are Portacabins. 
(In case portacabin is not a universal term, these are prefab wood/board buildings, transported from site to site and standing on metal feet. They can have plumbing and lighting and be quite comfortable.)
The path work there is exclusively heart and lung, mostly being biopsies for rejection or opportunistic infection.
Imagine my surprise when I found every slide to be teeming with fungi. Small, big, short, long, fat, thin etc.
"Oh", I was told, "they drop from the hay insulation in the ceiling."
The pathologists lived with this quite happily, which is more than can be said for me.
Plane of section is an OK test when there's one or two, but this was ridiculous.

OK, say they didn't jump either:-)

BTW, after Bob Richmond's posting re. auramine-rhodanine for TB, which I used to do at another hospital years ago, I got the lasses here to do a couple for recent cases. The results were quite spectacular, like the desert sky at night!!!!

Terry L Marshall B.A.(Law), M.B.Ch.B., F.R.C.Path
Consultant Histopathologist
Rotherham General Hospital, Yorkshire
terry.marshall@rgh-tr.trent.nhs.uk