A couple of months ago, I had a little spider crawling all over my face while I was doing 80 mph in the highway.
I could hold the tickling until I got off at the next exit and removed the helmet.
I found out later that these little spiders live on a tree under which I park my bike.
The poor creature may have fallen from the tree and have been walking on the gas tank when I placed my helmet there just before leaving.
Since there, I always check inside the helmet before putting it on.