you know you have watched too much yugioh when

[Bitchboots]

When you post pictures of the supersexy photoshoot for all to see.  

[Death T-2]

...When you end up having dreamsex with Kaiba.
xd  

[Bitchboots]

When you imagine other people having dream smex with Kaiba. xd  

[Ryu_chan]

The Enchanted Butterfly

When you imagine other people having dream smex with Kaiba. xd

---and get turned-on by it.  

[Kaiba]

----- and fap to it.  

[Mai Kujaku-san]

I'm guilty of almost everything here... oh my...  

[ProphecyEmpress]

When you have a dream involving YGO in some way or form TWICE in a row. eek  

[Super Fightin Prototype]

When you truly believe that the green-haired Seto Kaiba is some kind of reptile due to his evil tendencies. After that, you start making up pairings involving brown-haired Kaiba and Green-haired Kaiba. And you even gave them separate names to distinguish the two apart; Greenie and Brownie.

You adapt the cunning-ness of the Green-haired Seto. You enjoy deceiving others and respond calmly while the other person is screaming in your face.

You think that the characters are smexy even in their poorly-animated first-series form. lol Jay Seto (see signature)  

[oni_kura]

When you have to call a friend at midnight just because you forgot something about the show and can't get back to sleep until you remember.

When your friend calls you at midnight just to ask you an incredibly obsure question about ygo just because they forgot, and you can give the correct answer even though you're still half asleep.