Some thoughts to pun-der:

1.  A dentist and a manicurist got married.  They fought tooth and nail.
2.  Show me a piano falling down a mineshaft and I’ll show you A-flat miner.
3. When you’ve seen one shopping center, you’ve seen a mall.
4.  A bicycle can’t stand alone.  It is two-tired.
5.  The guy who fell onto an upholstery machine was fully recovered.