Pretty simple game: Fill in the blank to complete the phrase, and then answer the phrase with a statement that sounds fine in context of whatever the blank word is but sounds like a funny/weird/sexual innuendo when it's referring to your significant other.
Here's some examples.
Your Motorcycle
"If you push up real tight, you can get three people on it."
Your Dog
"Hey, get off the mailman!"
Your Computer
"Next year, I'm getting rid of it and getting the new model".