Because they don't have a leg to stand on. Note: I'm a right leg amputee and I made this up myself.
The son says,"Nice try dad, a chair!" "Not this time son, our dog is dead"
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Well, you're standing naked in my closet..."
Non-athletic-sport-centered-around-rednecks (I heard this forever ago and wanted to share. Sorry if it happens to be a repost.)
Bee flat Music joke for those who don't understand. B flat is a note.
Prism (Note: I made this joke up. Sorry if this little note refracts from the humour.)
Because he's lack-toes intolerant.