Him: You're late!
You: Sorry, it's only a few minutes.
Him: You said half past seven, now it's five past eight!
You: I must have said eight, it's in my diary 
[He did say eight]
You: OMG the car's been stolen!
Him: It's in for a service, I told you last week.
You: No, I would have remembered, I've got an interview this morning!
Him: I told you, you said you'd get a bus.
You: No, I'd have remembered, I've missed the bus now!
[He didn't tell you; he booked the service after you told him about the interview]
You: What kept you out so late last night?
Him: Last night?
You: I heard you come in at 2am ...
Him: No, I was back by 10, you were asleep on the sofa.
You: ???
Him: Haha, you must have dreamt it.
[You were asleep in bed; he came in at 2]
Him: STOP SHOUTING AT ME!
You: Shouting? 
Him: YOU'RE ALWAYS SHOUTING, IT'S RUINING OUR MARRIAGE!
You: OMG, what have I done to upset you?
[Nothing you did, and you weren't shouting]
Him: Can you get those burgers out of the freezer?
You: Umm, there aren't any burgers ...
Him: Yes, I bought a pack the other day. Look, here's the receipt.
You: Wonder where they've gone? The kids had pasta last night.
Him: You must have eaten them ...
[Believe it or not, this one's quite common!]
Him: Where did you put DD's hockey stick?
You: Haven't seen it since Saturday's match.
Him: Well it's not in the hall, and she needs it today.
You: Are you sure you brought it back on Saturday?
Him: Yes, I remember putting it in the car.
[You turn house & car inside out ...]
You: Are you SURE you brought it back?
Him: YES OF COURSE, I TOLD YOU I REMEMBER! You had the car last, WHAT DID YOU DO WITH THE HOCKEY STICK?!
[True story - the stick was at the sports centre, of course]
If you're an East Enders fan: It's what Nick & Dotty did to Dot Cotton last year. They look like small things: "lost" keys and "forgotten" appointments, etc; but mount up until you really don't know your own mind.