Humbly, we think the joke goes better this way: 

"Why is there an expiration date on sour cream?  I mean, what happens if it expires? Does it go ... good?"

• Card #342 on Beckett
• SABR Bio by Malcolm Allen
• The Infamous Conehead Mask
• The Mask strikes in Houston
• Larry doing material for NBC
• 1993 Phils - "High Hopes"
• Bagwell HOF speech including Larry