Green monster loose in the World Museum

Some of Mike's fishy friends from the aquarium
We were once offered a large green Iguana which had out grown its owner’s home. It's owner told us that it was about 4.5 foot long - which we assumed was an exaggeration - and when she appeared with a tiny zipped shopping bag, we thought our assumptions were correct. I made the big mistake of opening it in the public gallery to have a quick look and this 4.5 foot monster poked its head and shoulders out of the bag. How she got it in there in the first place was beyond me! It scanned the area in a nonchalant sort of way and then leapt out and scuttled off down the gallery. We had a marble floor and it wasn't really able to run on this surface, so it made loads of noise which alerted the visitors and of course lead to absolute pandemonium. I rugby tackled it at the end of the corridors and managed to get back into the lab area.
In that job, no two days were the same and you had to expect the unexpected at all times!