When my husband and I first started dating, I told him the word gullible was not included in the dictionary. He promptly went and got the dictionary and looked it up. He said "yes it is, it is right here" I said "ok, now read me the definition" . He is the only person I have gotten to fall for that one. We still laugh about it 15 years later.
He used to let our daughter do his hair. One night, we ordered pizza, when my husband answered the door he had one pink barrette he didn't take off left in his hair. The pizza man was hitting on him, and I was laughing too hard to tell him he looked so sweet in his pink barrette. He couldn't figure out why the pizza man was so friendly.
Normally I don't prank my husband, but he is so sweet and nieve, sometimes I can't help myself. He has a wonderful sense of humor and takes it well.