The Bavli, Shabas 31 amud 1, has two stories in which a gentile came to Shamay asking to be converted to Judaism, upon which Shamay "pushed him with the construction cubit in his hand". Rashi explains ...
The Gemara (Bab. Shab. 146b) discusses certain rules that pertain to a house that is entirely sealed. What kind of house is entirely sealed? If it means what it seems to mean, that it has no entrance ...