1. Secretly knitting him this trendy sweater, and making him wear it in public.
2. Secretly knitting yourself a trendy sweater too, and wearing it to your movie night.
3. Getting together with your friend, grandmother, coach, or acquaintance from the book club, and doing something unexpected and absurd.
4. Start mastering a style of dance you've never tried before, and demonstrate your skills constantly to your husband, with the implication that you're already quite good at it.
5. Surprise your husband with the purchase of a new pet.
6. Greet your husband after he arrives home from work in an elegant outfit, complete with a good mood, and, of course, a dance
7. Maybe you could even make the spontaneous decision to remodel your kitchen. No, not simply to redecorate it - that would be easy, and not at all exciting. What you need to do is remodel it completely. For instance, you could do this. Naturally, you need not mention anything before your husband leaves for work in the morning. Surprise!
All photos, except for the last one, have been found around the Internet. The last one is directly from my kitchen.