There a spider loose about the hoose

Taking my cup of tea back up to bed this morning I noticed an enormous spider on the stair skirting. 

When I went back down later it had gone. 

Husband said, 'So it's gone. What are you upset about?'

He doesn't grasp the difference between knowing there are undoubtedly spiders in the house and knowing there is a spider in the house. And a huge one at that.