Acid Bugs...

Meet every Mercy Shippers worst nightmare! Acid Bugs are located on Decks 7 and 8 of the Africa Mercy and have caused numerous skin irritations to crew members. If you crush one on your skin, it will leave a nasty burn. The fear of these small critters often has me turning around and keeping an eye out for any bugs in the vicinity. It's a small price to pay for the privilege of serving here with Mercy Ships!

 They seem to hang out on ceilings and walls - meaning they can drop down on the unsuspecting crew member!