diff --git a/samples/forgetfs/forget_fs.go b/samples/forgetfs/forget_fs.go
new file mode 100644
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--- /dev/null
+++ b/samples/forgetfs/forget_fs.go
@@ -0,0 +1,45 @@
+// Copyright 2015 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package forgetfs
+
+import "github.com/jacobsa/fuse"
+
+// Create a file system whose sole contents are a file named "foo" and a
+// directory named "bar".
+//
+// The file "foo" may be opened for reading and/or writing, but reads and
+// writes aren't supported. Additionally, a file named "bar" may be created
+// anew an arbitrary number of times in any directory, but it will never exist
+// in lookups by name.
+//
+// The file system maintains reference counts for the inodes involved. It will
+// panic if a reference count becomes negative or if an inode ID is re-used
+// after we expect it to be dead. Its Check method may be used to check that
+// there are no inodes with non-zero reference counts remaining, after
+// unmounting.
+func NewFileSystem() (fs *ForgetFS, err error) {
+	fs = &ForgetFS{}
+	return
+}
+
+type ForgetFS struct {
+	fuse.Server
+}
+
+// Panic if there are any inodes that have a non-zero reference count. For use
+// after unmounting.
+func (fs *ForgetFS) Check() {
+	panic("TODO")
+}