When I'm travelling in a vehicle, I count 1,2,3 up to telegraph poles, signposts etc. or marks on the road (like pothole repairs). It's from when I rode horses and was learning to jump, instructor had me shout the last three strides before the jump. The telegraph poles etc. are the "jump". I've done it most of my life now.
Only when I'm sat in a front seat, mind. Oh, and I'm counting in my head, not out loud!
With the hot water teeth brushing, does the partner have teeth that are sensitive to cold? I use warm water because of this.