Just import the ATV from TheHunter: COTW and we’re done 
How about a tandem bike where when u ride it you go faster than a normal bike. What Id think should happen is that when u are on the tandem you accelerate slower but u soon pick up speed (obviously when u are riding the bike with 2 people u go faster and I mean speed over time not accelerate). A stupid idea yes but I kinda want to see it.