Here is something not that simple. Rubber bridge, you are South (both vul) East is dealer and opens 1. You overcall 1 and soon reach 4. Peace and love, nobody doubles (assume trumps 3-2) and West leads diamond Jack. Whatever you do, they play a second round. Take it from here ...

Watcha yo step!

Rubber bridge, you are South dealer (none vul), and open 1NT. After a simple Stayman sequence (silent opponents) you arrive at 4 (why not direct 3NT, you wonder). West leads small diamond, East takes both ace and king and switches to clubs.

You are not quite happy with the development so far. Cash the ace of hearts - West drops the queen. Small heart from dummy, East follows small.

Watcha yo step!

Rubber bridge, you are South, and after two passes West opens 1 heart. North overcalls 1 NT and after East's pass you close the action with 4 spades. West leads small club.

Watcha yo step!

Here is something no that simple. Rubber bridge, you are South playing 7NT. No opposition and West leads heart jack:

Watcha yo step!

Hi, there!  

Here is something even more simple. Rubber bridge, you South open 1, partner 3, and you -- 4. All pass.

West leads diamond queen.

Watcha yo step!