Mark is getting old...

Here is what happened at 10am this saturday morning:

Mark gets into the shower. I am confused....

Anna: "Did you not already have a shower this morning??"
Mark: "No, I've been waiting to have one"
Anna: "But weren't you using the hair dryer earlier?"
Mark: "......no....."
Anna: "But why is your bath towel all wet?"
Mark: ".......ermmm........ohhh......I've already had a shower."

He had genuinely forgotten he'd had a shower only a couple of hours before!!