You never quite know how someone—even someone you're close to—will respond to a surprise, let alone a prank. Probably not well. How well a person keeps it together, or, in these cases, totally loses it when pranked says a lot about them.
1. Cutting crew.
2. Just kickin' it.
3. In England they call water balloons "leaky jims," probably.
4. His hands are tied.
5. A huge reaction to a little fake spider.
6. A huge reaction to a huge but kind of lame fake spider.
7. Ya burnt.
8. Schrodinger's pregnancy prank.
9. Did you hear that?
10. Having a blast.