Of course, you could take a wooden plank from the shed, and there are undoubtedly some who can do it this way: front wheel off the ground and a little blipping of the throttle.
But, believe us when we say that a proper ramp is a far safer option. They are foldable, light and much safer than wooden planks that may break when you're halfway up. And do you really want this to be your first attempt at stunt riding? Besides, these ramps cost a lot less than the repairs your bike will need, should you still decide to go for the mouldy plank technique.