Ants in your pants?

As I sat on the couch to put on my shoes, I felt something akin to a small sharp pain on the back of my lower leg.

I reached up the leg of my pants to brush off what I assumed would be a bit of grit or piece of tree that had come in with the washing and gotten attached to my pants.

Instead I found myself gripping something small, black and moving. I flung it away as my first thought was "SPIDER". I then realised that that was pretty dumb, because if a spider bit me, I'd need to know what kind of spider it was.

After hunting the floor (with one hand clutching the bite area - it was starting to hurt) I found a mid-sized, dazed black-coloured ant

So yes, in fact I did have an ant in my pants this morning.