I've done this except I don't actually put it in my mouth. I hold it close to my mouth and pretend lol
Our favorite game is "keep away from Mommy." Mandie will get a toy in her mouth (usually a squeaky one lol) and I'll crouch down and slowly walk towards her and say, "I'mmm gonna GET it!" "Gimme that toy"...and she'll take off! I'll chase her around the living room, the dining room, the kitchen, the bedroom...I'll hide behind a wall sometimes and then I'll run the other way and she'll chase me...until I turn. Then she runs away again. lol
I do this same thing with Shelby. He loves that and he loves to play catch...ball/frisbee/whatever. He likes to jump up and catch and show what a smart boy he is.