How can I prevent accidental pasting in bash?

I run bash as my shell of choice; and I am always accidentally pasting the wrong block of text in there - it can get annoying really quickly.

I also use irssi as my irc client (irssi > *), and I love how it warns you if you paste something over 5 lines long, and lets you cancel instead of sending it. I'm wondering if there is an extension of some sort to bash that enacts paste-protection like this. Anybody know?