At the most random of times as well.

CIBR-JP034 比翼レンリン Hiyoku Renrin / Conjoined Bird Renrin

Dark Dragon / Union / Effect

LV3 1500/0

(1) Once per turn: You can activate 1 of these effects.

• Target 1 face-up monster you control; equip this card to that target.

• Unequip this card and Special Summon it.

If a monster equipped with this card would be destroyed by battle or card effect, destroy this card instead.

(2) The original ATK of a monster equipped with this card becomes 1000, also it can make a second attack during each Battle Phase.

Note: This thing is a reference to a legendary Chinese creature called the Biyiniao, a species of bird that was said to be born with only one wing, so the males and females have to stay together in order to fly. Over the years the term biyi has been used to describe lovers who are very close.

Source