gag — to introduce usually comic interpolations into (a script, an actor's part, or the like) (usually followed by up).
lark — a merry, carefree adventure; frolic; escapade.
mischief — conduct or activity that playfully causes petty annoyance.
prank — a trick of an amusing, playful, or sometimes malicious nature.
rib — one of a series of curved bones that are articulated with the vertebrae and occur in pairs, 12 in humans, on each side of the vertebrate body, certain pairs being connected with the sternum and forming the thoracic wall.
romp — to play or frolic in a lively or boisterous manner.
scrape — to deprive of or free from an outer layer, adhering matter, etc., or to smooth by drawing or rubbing something, especially a sharp or rough instrument, over the surface: to scrape a table to remove paint and varnish.