Single-file HTML prank app the friend runs with the window always visible.
Reversible gags only (fake BSOD, fake virus->joke+confetti, screen crack,
glitch, fireworks, beep); any key/ESC/click dismisses. No file writes,
no autostart, no hiding, no network.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
