Impetuous1, I had a girlfriend who walked very quickly as well. Now, I can walk quickly, and I will if I need to be fast... but that is often not the case, so I just walk leisurely. I'm a very laid-back person in general. She, on the other hand, took every walking step like she was in a speed-walking race. Because of this, I was constantly lagging behind her (we thought it was amusing, so it almost became a joke in itself). Like in the grocery store or a department store, she'd speed-walk to one place, I'd catch up and she'd be looking at things, then she'd speed-walk to another nearby area, and I'd saunter over in her direction... this constant pace of having to reunite us whenever she took off drove me to one of the most fun and exciting practices I've done with a girlfriend- the "just met" game.
For those who haven't done it, it goes like this: you walk up to your already-S.O. and try to pick them up like you've just met. "Hey... those are some nice shoes. You have good taste. I'm analog." or "Miracle Whip, huh? I also enjoy the tangy zip of Miracle Whip over any old mayonnaise... hi, i'm analog, nice to meet you.

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Several funny things can happen from there:
1. She plays along nicely, you lay down your cheesiest lines and they floor her- you quickly end up kissing and groping her.
2. She plays along, but pretends she's annoyed by you, you're not her type, etc.
3. She doesn't play along, which is just funny for you. lol
The absolute funniest combination, though, is if she plays along nicely, and another person (or people) are right there within earshot, hearing you lay down the weakest, most pathetic game they've ever heard, and she appears to be eating it up. Then, they see you make out after having "just met".
One time, we were right near this probably 20 year old guy, and I was intentionally putting out the absolute worst pick-up lines and cheesy talk I could muster, and she was loving it to the point that she lunged at me and started kissing me, feeling me all over with her hands- and I swear to God, I hear the kid whisper to himself, "what the fuck?" as in, "how the HELL did that work?" I would love to know if he tried it for himself.
One of the funniest things to do to occupy my time while we went out shopping.
