I have often been in that situation. It always makes me think of Cheaper by the Dozen and Unavoidable Delay.
Things that worked well:
card games like Uno/ go fish/ old maid/ memory match etc
yahtzee
puzzle games like mad libs, sudoku, word search etc
electronics- the nintendo ds/ iPod Touch or iPod were created for these times
if room allows for more active stuff, jump rope, ball, etc
simple projects like stringing beads
workbooks
barbie dolls/ small toys