[chrisbuc]

I'm sure someone can get it smaller than this (save as .html)

  <input id="i">
  <button onclick="l.textContent='Now do '+i.value">Do This</button>
  <button onclick="l.textContent='Do nothing'">Do Nothing</button>
  <label id="l"></label>

[sebastiennight]

    data:text/html;,<input id=i><button onclick="l.textContent='Now do '+i.value">Do</button><button onclick="l.textContent='Do nothing'">Nope</button><label id=l>

Will work in your browser if you copy/paste it. Or as a QR code: https://d1yei2z3i6k35z.cloudfront.net/2914/6815454b25323_qr-...