Because it's made out of vibranium.
Interactive Joke of the Day Mug
Coffee Mug
What's Captain America's shield made of Vibranium. What's Hawkeye's shield made of Quicksilver.
Vibranium. What is Hawkeye's Shield made of **Quicksilver**
Quicksilver
A sub woofer. Thank you & God Bless
The woman replies, "I'll take a double entendre." So he gave it to her.
A Star-Spangled Banner.
Dad dad look what marma-laid' !
In the toilet.
Because a black widow has no husband.