This one's quick and easy. I've found it also helps get a kid's attention back when they're getting bored and possibly mischievous.
All you need to do is say: "I'm thinking of an animal. See if you can guess what it is. Here's a hint: schmippopotamus."
If your kid is old enough (three and above, certainly), they'll get the joke, and correctly figure out the animal.
Keep naming animals, but with the "schm–" sound at the beginning instead of the actual consonant sound. So, make them figure out the true identity of a schmiraffe, a schmea lion, a schmuirrel, a schmelephant, and so on.
This is fun, but it's probably better for younger kids. I haven't tested this out personally, but you might not want to try it on any teenagers.
| good any time, good for a restaurant or public place, verbal activity, |